Attachment L-2 MSD Intervention Study Design Revised 11_1_11

Attachment L-2:

MSD Intervention Study Design

Oct. 2011

Oct. 2012

Oct. 2013

Oct. 2014

0 Base-line A

3

6

9

12 Base-line B

15

18

21

24

27

30

33

36

Group A (R) 36 est. 384 emp.

OI-1

X

OI-2

OI-3

OI-4

OI- 5

OI-6

OI-7

OI-8

OI-9

OI-10

OI-11

OI- 12

OI- 13

Group B (R) 36 est. 384 emp.

OI-1

OI-2

OI-3

OI-4

OI- 5

X

OI-6

OI-7

OI-8

OI-9

OI-10

OI-11

OI- 12

OI- 13

Notes: “O” denotes data collection, and “X” denotes intervention, PHT-TLG. OI = MSD Symptoms, Exertion (Individual employee level). The self-reported general work environment and health survey (Attachment H-4) will be collected at the start of the study and once every year for 2 years. The self-reported low back pain (Attachment H-1), self-reported shoulder/ arm pain (Attachment H-2), and self-reported specific job tasks and safety incidents (Attachment H-3) surveys will be collected at the start of the study and every 3 months for 2 years. Low Back Functional Assessment (Attachment I) will be completed by 20% of participating employees at the start of the study and once every year for 2 years.

Target # of Establishments to recruit from each size category	Establishment Size Category for Total Employees	Mean Total Employees per Site	Mean Impacted Employees per Site	Average # PHT-TLG per site	Total #PHT-TLGs	Total Impacted Employees
24	<20	10	2	1	24	48
24	20-99	50	10	3	72	240
24	100+	100*	20	5	120	480
				Totals	216	768+
*Most companies will be near the lower end of the strata + 960 subjects are expected with replacements