| Work history | | | | |
| Job title | | | | |
| Engineer | 79% | 83% | 73% | 73% |
| Leader | 14% | 10% | 16% | 14% |
| Manager | 8% | 8% | 12% | 14% |
| Seniority in months | 169 (145) | 176 (143) | 185 (151) | 187 (154) |
| Demographic characteristics | | | | |
| Female | 33% | 25% | 24% | 29% |
| Age in years | 41.2 (8.43) | 43.3 (10.8) | 42.6 (10.3) | 44.4 (9.66) |
| Body mass index | 27.3 (4.41) | 26.5 (5.64) | 26.3 (5.07) | 26.4 (4.22) |
| Right-handed | 87% | 90% | 86% | 92% |
| Single | 27% | 19% | 24% | 22% |
| Educational level | | | | |
| High school | 8% | 4% | 12% | 10% |
| College | 31% | 37% | 47% | 20% |
| Graduate school | 62% | 60% | 41% | 71% |
| Ethnicity | | | | |
| African American | 2% | 0% | 0% | 0% |
| Asian or Pacific Islander | 12% | 21% | 12% | 12% |
| Hispanic | 10% | 12% | 10% | 4% |
| White | 69% | 60% | 71% | 82% |
| Other | 8% | 8% | 8% | 2% |
| Previous surgery in upper extremities or neck | 6% | 10% | 14% | 10% |
| Pregnant | 0% | 0% | 0% | 2% |
| Oophorectomy | 2% | 2% | 6% | 8% |
| Menopausal | 6% | 8% | 6% | 8% |
| Medications | | | | |
| Oral oestrogens (BCP or HRT) | 6% | 10% | 18% | 8% |
| Birth control pills (BCP) | 4% | 6% | 14% | 4% |
| Hormone replacement therapy | 2% | 4% | 4% | 4% |
| Current smoker | 4% | 0% | 0% | 8% |
| Activity h/week (off from work) | | | | |
| Hand intensive | 14.4 (13.1) | 15.7 (12.3) | 12.8 (10.2) | 14.8 (11.1) |
| Aerobic | 1.24 (1.96) | 1.81 (2.22) | 2.31 (2.97) | 2.67 (3.72) |
| Pre-intervention upper body discomfort scores | | | | |
| Neck/shoulder | 1.60 (2.03) | 1.75 (1.86) | 1.83 (2.32) | 2.22 (2.18) |
| Right upper extremity | 1.82 (1.81) | 1.37 (1.78) | 1.50 (1.73) | 2.25 (2.41) |
| Left upper extremity | 0.71 (1.19) | 0.61 (0.92) | 0.97 (1.74) | 0.57 (0.89) |
| Distribution of psychosocial factors by intervention group | | | | |
| Work schedule flexibility score (higher values indicate lower work schedule flexibility) | 0.21 (0.18) | 0.25 (0.20) | 0.21 (0.20) | 0.26 (0.27) |
| (Demand/control) ratio score (higher values indicate higher demand/control ratio) | 0.47 (0.08) | 0.48 (0.07) | 0.48 (0.09) | 0.48 (0.08) |
| (Demand/(control + support)) ratio score (higher values indicate higher (demand/(control + support)) ratio) | 0.31 (0.05) | 0.32 (0.05) | 0.32 (0.07) | 0.32 (0.05) |
| Job strain score (higher values indicate lower job strain) | 36.2 (7.75) | 34.9 (7.33) | 35.3 (7.06) | 35.6 (7.17) |
| Iso strain score (higher values indicate lower iso strain) | 70.5 (9.84) | 68.2 (9.62) | 69.3 (8.92) | 70.4 (9.59) |
| Job dissatisfaction score (higher values indicate higher job dissatisfaction) | 0.37 (0.17) | 0.38 (0.17) | 0.39 (0.19) | 0.36 (0.22) |
| Job insecurity score (higher values indicate higher job insecurity) | 6.35 (2.63) | 6.21 (2.03) | 5.79 (1.72) | 6.41 (2.64) |
| Effort/reward imbalance score (higher values indicate lower effort/reward imbalance) | 0.57 (0.24) | 0.52 (0.21) | 0.60 (0.37) | 0.60 (0.30) |
| Physical and psychosomatic strain score (higher values indicate higher physical and psychosomatic strain) | 0.21 (0.14) | 0.19 (0.15) | 0.18 (0.14) | 0.21 (0.16) |
| Mental exhaustion score (higher values indicate higher mental exhaustion) | 0.51 (0.29) | 0.33 (0.30) | 0.43 (0.34) | 0.55 (0.34) |
| Physical exhaustion score (higher values indicate higher physical exhaustion) | 0.30 (0.28) | 0.24 (0.27) | 0.31 (0.29) | 0.27 (0.27) |
| Sleeping problems score (higher values indicate higher sleeping problems) | 0.31 (0.29) | 0.24 (0.25) | 0.24 (0.27) | 0.27 (0.26) |
| Headache score (higher values indicate higher headaches) | 0.31 (0.32) | 0.24 (0.29) | 0.32 (0.34) | 0.35 (0.39) |
| Role limitations due to physical functioning (higher values indicate higher role limitations due to physical functioning) | 78.9 (33.3) | 78.8 (33.7) | 72.1 (39.6) | 83.3 (28.1) |
| Role limitations due to emotional functioning (higher values indicate higher role limitations due to emotional functioning) | 85.6 (29.0) | 87.2 (24.8) | 83.0 (33.6) | 83.7 (25.3) |
| Social functioning score (higher values indicate higher social functioning) | 80.3 (21.8) | 83.7 (20.3) | 75.5 (25.7) | 81.5 (23.4) |