Att. I_Seat Beat Fit Measurements

Update the Height Recommendation for Proper Seat Belt Fit among Children

Att. I_Seat Belt Fit Meas_051916

Att. I_Seat Beat Fit Measurements

OMB: 0920-1145

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Attachment I
Form Approved
OMB No.: 0920-xxxx
Expiration Date: XX/XX/XXXX
Public Reporting burden of this collection of information is estimated at 2.5 hours per response, including the
time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and
completing and reviewing the collection of information. An agency may not conduct or sponsor, and a person is
not required to respond to a collection of information unless it displays a currently valid OMB control
number. Send comments regarding this burden estimate or any other aspect of this collection of information,
including suggestions for reducing this burden to CDC/ATSDR Reports Clearance Officer, 1600 Clifton Road NW,
MS D-74, Atlanta, GA 30333; Attn: PRA (0920-XXXX).

Seat Belt Fit and anthropometric Measurements
Thank you for coming in today. Your child is being asked to participate in a study to update the rules
for booster seat and seat belt use in children ages 6-12. If you agree to allow your child to participate, I
will ask you to sign an Informed Consent Form that we will go over in a moment. I will also ask your
child if he/she would like to participate in the study as well. If he/she also agrees to participate, I will
review the Informed Assent Form with your child and have him/her sign the form as well.
During the study, the following measurements will be collected from your child:
•
Standing and sitting height,
•
Upper and lower leg length,
•
Shoulder height and width,
•
Chest circumference,
•
Waist circumference,
•
Hip width, and
•
His or her weight.
We will also be taking measurements while your child sits in different seating positions in three different
vehicles to help us see how well the seat belt fits. In order to take the measurements, our researchers will
have physical contact with your child. For example, to measure the seat belt fit we will need to measure
the location of the hipbone and the shoulder, which will require a researcher to feel for the appropriate
locations. All child participants will be measured in front of their parents.
To better help collect these measurements your child has been provided a uniform consisting of a cotton
t-shirt and pants. The clothing items provided will help us to get a more accurate measurement.
You will be asked to be present at all times. The entire session will take up to 2 hours to complete. We
will be videotaping and taking photographs to help with writing a report of our findings. As part of the
informed consent process you will also need to give us permission to videotape and photograph your
child while they are participating in this study.
Is it O.K. if we proceed to reviewing the Informed Consent/Assent forms?
Wait for parent to indicate that it is OK to proceed, and then move on to reading the Informed Consent
to them.

Anthropometric Measures Anthropometric Measures
Description

Item
Variable Name
ChildID
CollectionDate

Label
Child ID
Collection Date

Format

1
2

antWeight

Measured Weight

Decimal

antStandingHeight

Standing Height

Decimal

BMI

Body Mass Index

Decimal

Unique ID assigned to the child participant.
The date when the participant was measured.
Measurement of the child participants' weight while
standing using a digital scale. See Weight protocol for
specifics.
A measure of total skeletal length obtained when the
child participant is standing. See Standing Height
protocol for measurement specifics.
A calculation of body fat based on height and weight
(from 12-36). See BMI protocol for specifics.
A categorization of the BMI value. Categories
correspond to < 18.5, 18.5 - 24.9, 25-29.9, and >30,
respectively.
Chest circumference will be measured using a flexible
ruler circumnavigating the chest just below the
armpits with the arms hanging downward along the
abdomen.

BMICategory

Body Mass Category

Text

ChestCircum

Chest Circumference

Decimal

HipCircum

Waist Circumference

Decimal

ESittingHeight

Erect Sitting Height

Decimal

Waist circumference will be measured using a flexible
ruler circumnavigating the waist just above the ASIS.
A measure of the child participants' sitting height
measured from the crown of the head to the base
upon which the participant is sitting. See Sitting
Height protocol for specifics.

Decimal

A measure of the distance from the seating surface to
the most level spot on the top of the shoulder.

10 SittingShoulderHeight Sitting Shoulder Height

11 SittingKneeHeight

Sitting Knee Height

Decimal

12 LumbarSpineFlex

Lumbar Spine Flexion

Decimal

Measurement of the child participants' lower leg,
from the popliteal fossa behind the knee to the
bottom of the heel. During this measurement the
participants' legs are fully extended with feet resting
on the floor and the knees and ankles at a 90 degree
angles. See Knee Height protocol for specifics.
Baseline value is calculated as the distance between
the head CG and the hip CG when in an erect sitting
position (Reed, 2008; Reed, 2006). Slouch is measured
as the shift in this distance.

Decimal

Measurement of the widest part of the child
participants' shoulder width when in the seating
position. During this measurement the child will sit
with their back to a flat and vertical surface. See
Sitting Shoulder Width protocol for specifics.

13 SittingShoulderWidth Sitting Shoulder Width

14 SittingHipWidth

Sitting Hip Width

15 BPL

Buttock-popliteal length

16 ID

17 HeadCG

Head CG

18 HipCG

Hip CG

Measurement of the widest part of the child
participants hip width when in the seating position.
Decimal See Sitting Hip Width protocol for specifics.
Measured horizontally from a vertical plane tangent to
buttocks to the popliteal fossa behind the knee with
child in a standardized erect sitting position (see
Decimal Bilston, 2007; Huang, 2006).
A field populated automatically by MS Access with an
unique sequential number associated with each
record.
Text
The 3-dimensional coordinate that estimates the
3D
Coordinate center of gravity of the subject's head (Reed, 2006).
The 3-dimensional coordinate that estimates the
3D
Coordinate center of gravity of the subject's hips (Reed, 2008;

Body Position
Crosswalk
Units of
During
Measurement Page #
Measurement
3
NA
NA
3
M/DD/YYYY
NA

Standing

kg/m2
Underweight,
Normal,
Overweight,
or Obese

Standing

Sitting

1- n

N/A

Sitting

Child Vehicle Seat/Booster Seat Fit

Variable Name

Label

ID
VehicleID
ChildID

ID
Vehicle ID
Child ID

BoosterID
UpperLegAngle
LowerLegAngle

Booster ID
Upper Leg Angle
Lower Leg Angle

HeelLocation

Heel Location

HipCG

HeadCG

Head CG

Slouch

InShoulderBeltPosition

Inboard Shoulder Belt Position

Format

Description

A field populated automatically by MS Access with an unique sequential
number associated with each record.
A unique ID assigned to the vehicle.
Unique ID assigned to the child participant.
A unique ID assigned to the booster seat. In addition to the boosters, a None
value will be used to identify the measures associated with having no booster
Text
in the ChildVehicleBoosterFit table.
Decimal The angle of the thigh relative to horizontal. Measured with an inclinometer.
Decimal The angle of the shin relative to horizontal. Measured with an inclinometer.
3D
The location of the bottom center of the heel bone.* This can be used in
Coordinate conjunction with FloorLocation to calculate an offset distance.
3D
Coordinate Digitized location of the center of gravity of the hips.* (Reed, 2008; Reed, 2006).
3D
Digitized location of the point approximating the center of gravity of the head.*
Coordinate (Reed, 2006)
Distance from the Head CG to the Hip CG.* (Reed, 2008; Reed, 2006) The child's
posture in the seat, usually judged from the pelvis angle and the space between
the [booster] seat back and the child's buttocks. This measure would be
compared to the similar measure (Lumbar Spine Flexion) made during the
Decimal anthropometry measurements as a baseline.
Integer
Text

3D
Coordinate

3D
OutShoulderBeltPosition Outboard Shoulder Belt Position Coordinate

Suprasternal

Suprasternal Landmark

3D
Coordinate

Acromion

Acromion Landmark

3D
Coordinate

UpperLLapBeltPosition

Upper Left Lap Belt Position

UpperRLapBeltPosition

Upper Right Lap Belt Position

LowerLLapBeltPosition

Lower Left Lap Belt Position

LowerRLapBeltPosition

Lower Right Lap Belt Position

LeftASIS

Left ASIS

RightASIS

Right ASIS

3D
Coordinate
3D
Coordinate
3D
Coordinate
3D
Coordinate
3D
Coordinate
3D
Coordinate

SBeltXZAngle

Shoulder Belt XZ Angle

Decimal

SBeltYZAngle

Shoulder Belt YZ Angle

Decimal

LBeltXZAngle

Lap Belt XZ Angle

Decimal

Digitized location of the inboard edge of shoulder belt on chest at height of
suprasternal landmark. (Reed, 2013; Reed, 2009; Reed, 2011; Reed, 2008).* This
is used to calculate the centerpoint of the belt where it crosses the clavicle.
Digitized location of the outboard edge of shoulder belt on chest at height of
suprasternal landmark. (Reed, 2013; Reed, 2009; Reed, 2011; Reed, 2008).* This
is used to calculate the centerpoint of the belt where it crosses the clavicle.
Digitized location of the suprasternal landmark. (Reed, 2013; Reed, 2009; Reed,
2011; Reed, 2008).* This is used to calculate the centerpoint of the shoulder,
along the clavicle, where the shoulder belt crosses it.
Digitized location of the acromion landmark. (Reed, 2013; Reed, 2009; Reed,
2011; Reed, 2008).* This is used to calculate the centerpoint of the shoulder,
along the clavicle, where the shoulder belt crosses it.
FARO arm to digitize upper/lower edges of lap belt on pelvis with respect to
ASIS. (Reed, 2013; Reed, 2009; Reed, 2011; Reed, 2008) The position of the lap
belt relative to the abdomen, pelvis, and thighs
FARO arm to digitize upper/lower edges of lap belt on pelvis with respect to
ASIS. (Reed, 2013; Reed, 2009; Reed, 2011; Reed, 2008)
FARO arm to digitize upper/lower edges of lap belt on pelvis with respect to
ASIS. (Reed, 2013; Reed, 2009; Reed, 2011; Reed, 2008) The position of the lap
belt relative to the abdomen, pelvis, and thighs
FARO arm to digitize upper/lower edges of lap belt on pelvis with respect to
ASIS. (Reed, 2013; Reed, 2009; Reed, 2011; Reed, 2008)
Digitized location of the ASIS on the left side of the participant's hip.* (Reed,
2008)
Digitized location of the ASIS on the right side of the hip.* (Reed, 2008)
Shoulder belt side-view XZ angle with respect to H-point (Reed, 2013; Reed,
2009; Reed, 2008;
Shoulder belt front-view YZ angle with respect to H-point (Reed, 2013; Reed,
2009; Reed, 2008;
Lap belt side-view XZ angle with respect to H-point (Reed, 2013; Reed, 2009;
Reed, 2011; Reed, 2008;

Units of
Crosswalk
Measurement
Page #
1- n
NA

N/A
11
11

Degrees
Degrees

11
11
11

Degrees

Child comfort questions
Item

Variable Name

Label

Format

1
2

ID
ChildID

ID
Child ID

Integer

ComfortHighbackBooster

Comfort In Highback
Booster

Text

ComfortBacklessBooster

Comfort In Backless
Booster

Text

ComfortSeatBeltOnly

Comfort In Seat Belt Only

Text

Description
A field populated automatically by MS Access with an unique sequential number associated with
each record.
Unique ID assigned to the child participant.
Child's perception of comfort while in each seat type.
Does how you are sitting / or does your booster seat / or does the seat belt feel uncomfortable?
If Yes, where do child feel uncomfortable
“On this picture show me what part of your body is uncomfortable.”
A. Why? Specify Answer:
B. On a scale of 1-5 with 1 being a little uncomfortable and 5 being very uncomfortable how
uncomfortable is the seat belt rubbing on your ____ (insert body part)?
C. Is there anywhere else that you feel uncomfortable? If yes repeat above. If no move on.
Child's perception of comfort while in each seat type.
Does how you are sitting / or does your booster seat / or does the seat belt feel uncomfortable?
If Yes, where do child feel uncomfortable
“On this picture show me what part of your body is uncomfortable.”
A. Why? Specify Answer:
B. On a scale of 1-5 with 1 being a little uncomfortable and 5 being very uncomfortable how
uncomfortable is the seat belt rubbing on your ____ (insert body part)?
C. Is there anywhere else that you feel uncomfortable? If yes repeat above. If no move on.
Child's perception of comfort while in each seat type.
Does how you are sitting / or does your booster seat / or does the seat belt feel uncomfortable?
If Yes, where do child feel uncomfortable
“On this picture show me what part of your body is uncomfortable.”
A. Why? Specify Answer:
B. On a scale of 1-5 with 1 being a little uncomfortable and 5 being very uncomfortable how
uncomfortable is the seat belt rubbing on your ____ (insert body part)?
C. Is there anywhere else that you feel uncomfortable? If yes repeat above. If no move on.

SafestSeat

Safest Seat

Text

Child's perception of safest seat type. And why?

LeastSafestSeat

Least Safest Seat

Text

Child's perception of least safe seat type. And why?

SeatTypeMostComfortable

Seat Type Most
Comfortable

Text

Child's perception of most comfortable seat type. And why?

SeatTypeMostUnomfortable

Seat Type Most
Uncomfortable

Text

Child's perception of most uncomfortable seat type. And why?

Units of Measurement
1- n
NA

Highback Booster,
Backless Booster, Seat
Belt only, or None
Highback Booster,
Backless Booster, Seat
Belt only, or None
Highback Booster,
Backless Booster, Seat
Belt only, or None
Highback Booster,
Backless Booster, Seat
Belt only, or None

Qualitative Fit Assessment by Researcher
Item

Variable Name

Label

Format

Description

Slouch

Text

ShoulderBeltSnugness

Shoulder Belt Snugness

Text

The qualitative snugness of the shoulder belt as adjusted by the participant.

ShoulderBeltPosition

Shoulder Belt Position

Text

The position of the shoulder belt relative to the arm, shoulder, and face.

LapBeltSnugness

Lap Belt Snugness

Text

The qualitative snugness of the lap belt as adjusted by the participant.

LapBeltPosition

Lap Belt Position

Text

The position of the lap belt relative to the ASIS.

BoosterFit

Booster Fit

Integer

Time2Engage

Time To Engage

Decimal

Difficulty2Engage

Difficulty To Engage

Text

Qualitative assessment of the difficulty of routing the belt and buckling.

ThighAngleCat

Thigh Angle Category

Text

Categorical measure of thigh angle relative to horizontal.

ShinAngleCat

Shin Angle Category

Text

Categorical measure of shin angle relative to vertical.

FootPosnCat

Foot Position Category

Text

Categorical measure of the foot position relative to the seat.

SittingHeightCat

Text

Location of the child's head relative to the top of the rear vehicle seat.

CPSTShoulderPosition

Text

18
19
20

CPSTBack2Seat
CPSTLaponThighs
CPSTKneesBent

Text
Text
Text

CPSTShoulderFitOK

Sitting Height Category
Belt crosses shoulder &
neck?
Back is against vehicle
seat?
Lap belt crosses thighs?
Knees bend at seat edge?
Good fit w/ just shoulder
belt?

CPSTLapFitOK

Text

CPSTOverallBeltFitOK

Good fit w/ just lap belt?
Recommend just using
belt?

1
2
3

ID
VehicleID
ChildID

ID
Vehicle ID
Child ID

Integer
Text

BoosterID

Booster ID

Text

The fit of a child in a given booster. Extent of shoulder target coverage was
noted for some.
The amount of time required for the participant to climb into the seat, route
the belt, and buckle it from a starting point outside the vehicle.

Units of Measurement
1- n
NA

Crosswalk
Page #
N/A
13
13

13
Sitting Up Straight, Almost Straight,
Slightly Slouched, or Extremely
Little Slack, Snug Against, Clothing,
Compressing Skin, or Very Tight
Against Neck, On Shoulder But Close
To Neck, Centered On Shoulder, On
Shoulder But Close To Arm, or Over
Little Slack, Snug Against, Clothing,
Compressing Skin, or Very Tight
Flat Over Legs, Low Over Pelvis, Over
Pelvis, Over Abdomen, or
Approaching Ribcage
1 - 5 scale
Where 1 is comfortable fit and 5 is the
child is too large to physically fit in the
booster.

13
13

Seconds
Easy, Doable, Difficult, or Impossible
Without Assistance
Significantly Above Horizontal,
Slightly Above Horizontal, Horizontal,
Slightly Below Horizontal, or
Significantly Below Horizontal
Vertical, Nearly Vertical, About 45,
Nearly Horizontal, Horizontal
On Floor, Almost On Floor, Hanging
Over Seat, Parallel To Seat, or On Seat
Entire Head Below Seat, Ears Along
Seat, Ears Above Seat, Chin Above
Seat, or Head Almost Touching Roof

Does the shoulder belt cross between child’s shoulder and neck?

Yes or No

Is the child’s lower back against the vehicle seat?
Is the lap belt on child’s thighs?
Do the child’s knees bend at the end of seat?
Overall, does the shoulder belt properly fit the child? / OR/ As a CPS tech,
would you say this child has good shoulder belt fit using just the seat belt?
Overall, does the lap belt properly fit the child? / OR/ As a CPS tech, would
you say this child has good lap belt fit using just the seat belt?
Overall, does the seat belt properly fit the child? / OR/ As a CPS tech, would
you recommend this child to just use a seat belt?

Yes or No
Yes or No
Yes or No

13
13
13

Yes or No

13
13
13

File Type	application/pdf
Author	Angel, Karen C. (CDC/ONDIEH/NCIPC)
File Modified	2016-05-19
File Created	2016-05-19