. Author manuscript; available in PMC: 2015 Aug 28.

Published in final edited form as: Occup Environ Med. 2013 Jun 20;70(8):568–574. doi: 10.1136/oemed-2012-101287

Table 3.

Multivariate proportional hazards models for incident dominant hand CTS

	HR	95% confidence limits
Model 1
Time in forceful exertion
(≥20%–<60%) vs <20%	2.83	1.18	6.79
>60% vs <20%	19.57	5.96	64.24
BMI≥30 vs <30 kg/m²	3.19	1.28	7.98
Model 2
Threshold limit ratio per unit increase	1.40	1.11	1.78
BMI≥30 vs <30 kg/m²	3.26	1.45	7.31
Job strain^*
High vs low/active/passive	2.13	1.00	4.54

Job strain, psychological demand versus decision latitude as defined by Karasek’s Job Content Questionnaire.

Threshold limit ratio, Force/(7.78–0.78×HAL) based on American Conference for Governmental Industrial Hygienists Threshold Limit Value for HAL and Drinkaus 2005.

Age, gender and other potential covariates did not meet p<0.05 criteria for inclusion in the model.

15 participants had missing values for the job strain variables due to not completing the questionnaire.

BMI, body mass index; CTS, carpal tunnel syndrome; HAL, hand activity level.