Table 1.
Characteristics of the study participants
| Disabling LBP (n=110) |
Nondisabling LBP (n=608) |
P value | |
| Sex | |||
| Male | 31 (28.2%) | 115 (18.9%) | 0.026 |
| Female | 79 (71.8%) | 493 (81.1%) | |
| Age, years | 27.5 (24.0, 40.0) | 31.0 (24.0, 42.0) | 0.052 |
| Body mass index, kg/m2 | 21.6 (19.8, 23.3) | 21.2 (19.5, 23.9) | 0.793 |
| Occupation type | |||
| Registered nurse | 88 (80.0%) | 495 (81.4%) | 0.886 |
| Assistant nurse (practical nurse) | 2 (1.8%) | 16 (2.6%) | |
| Midwife | 4 (3.6%) | 18 (3.0%) | |
| Nursing aid | 16 (14.5%) | 79 (13.0%) | |
| Frequency of shift work, per month | 6.0 (2.5, 10.0) | 6.0 (0.0, 10.8) | 0.571 |
| Sleep duration | |||
| ≥6 hours | 78 (70.9%) | 436 (71.7%) | 0.864 |
| <6 hours | 32 (29.1%) | 172 (28.3%) | |
| Insomnia | |||
| Not have insomnia | 47 (42.7%) | 366 (60.2%) | <0.001 |
| Have insomnia | 63 (57.3%) | 242 (39.8%) | |
| Previous episode of LBP | |||
| No | 4 (3.6%) | 97 (16.0%) | <0.001 |
| Yes | 106 (96.4%) | 511 (84.0%) | |
| TSK | |||
| Low (≤17) | 18 (16.4%) | 252 (41.4%) | <0.001 |
| Middle (18 to 23) | 32 (29.1%) | 206 (33.9%) | |
| High (≥24) | 60 (54.5%) | 150 (24.7%) | |
| K6 | |||
| <10 | 78 (70.9%) | 485 (79.8%) | 0.038 |
| ≥10 | 32 (29.1%) | 123 (20.2%) | |
| Flexibility | |||
| Flexible | 75 (68.2%) | 443 (72.9%) | 0.314 |
| Not flexible | 35 (31.6%) | 165 (27.1%) | |
| Lifting | |||
| Not frequent | 45 (40.9%) | 289 (47.5%) | 0.2 |
| Frequent | 65 (59.1%) | 319 (52.5%) |
Data are presented as number (percentage) or median (25th, 75th percentile).
LBP, low back pain; TSK, Tampa Scale for Kinesiophobia.