Table 1 Baseline characteristics of eligible participants in the development and validation datasets
Variable | Whole dataset(N = 1439) | Development dataset(N = 1002) | Validation dataset(N = 437) |
|---|---|---|---|
Individual characteristics | |||
 Age | 34.41 ± 9.34 | 34.16 ± 9.21 | 34.97 ± 9.64 |
 BMI | 21.92 ± 3.03 | 21.98 ± 3.07 | 21.80 ± 2.94 |
 Average exercise times weekly | 2.35 ± 1.25 | 2.37 ± 1.28 | 2.30 ± 1.16 |
 Gender | |||
  Female | 722 (50.2) | 518 (51.7) | 204 (46.7) |
  Male | 717 (49.8) | 484 (48.3) | 233 (53.3) |
 Educational level | |||
  Middle school or below | 228 (15.8) | 163 (16.3) | 65 (14.9) |
  High school | 337 (23.4) | 233 (23.3) | 104 (23.8) |
  College degree or above | 874 (60.7) | 606 (60.5) | 268 (61.3) |
 Marital status | |||
  Singlehood | 417 (29.0) | 297 (29.6) | 120 (27.5) |
  Married | 1001 (69.6) | 690 (68.9) | 311 (71.2) |
  Divorced et al. | 21 (1.5) | 15 (1.5) | 6 (1.4) |
 Smoking habits | |||
  Non-smoking | 1104 (76.7) | 755 (75.3) | 349 (79.9) |
  Smoking | 259 (18.0) | 195 (19.5) | 64 (14.6) |
  No longer smoking | 76 (5.3) | 52 (5.2) | 24 (5.5) |
 Drinking habits | |||
  None | 1032 (71.7) | 710 (70.9) | 322 (73.7) |
  A little(≤one bottle beer daily) | 346 (24.0) | 246 (24.6) | 100 (22.9) |
  Much(>one bottle beer daily) | 61 (4.2) | 46 (4.6) | 15 (3.4) |
 Place of residence | |||
  City | 334 (23.2) | 231 (23.1) | 103 (23.6) |
  Villages and towns | 717 (49.8) | 494 (49.3) | 223 (51.0) |
  Countryside | 388 (27.0) | 277 (27.6) | 111 (25.4) |
 Monthly income (CNY) | |||
  < 1000 | 134 (9.3) | 100 (10.0) | 34 (7.8) |
  1000 ≤ < 5000 | 1006 (69.9) | 702 (70.1) | 304 (69.6) |
  5000 ≤ < 10,000 | 258 (17.9) | 176 (17.6) | 82 (18.8) |
  ≥ 10,000 | 41 (2.8) | 24 (2.4) | 17 (3.9) |
Work-related characteristics | |||
 Main nature of work | |||
  Brain | 460 (32.0) | 328 (32.7) | 132 (30.2) |
  Brain & manual | 739 (51.4) | 506 (50.5) | 233 (53.3) |
  Manual | 240 (16.7) | 168 (16.8) | 72 (16.5) |
 The intensity of daily work | |||
  Almost not | 321 (22.3) | 219 (21.9) | 102 (23.3) |
  Light | 765 (53.2) | 537 (53.6) | 228 (52.2) |
  Intergrade | 310 (21.5) | 219 (21.9) | 91 (20.8) |
  Heavy | 43 (3.0) | 27 (2.7) | 16 (3.7) |
 Vibration | |||
  Systemic | 43 (3.0) | 31 (3.1) | 12 (2.7) |
  Partial | 292 (20.3) | 199 (19.9) | 93 (21.3) |
  None | 1104 (76.7) | 772 (77.0) | 332 (76.0) |
Psychosocial characteristics | |||
 SF1 | 3.24 ± 0.64 | 3.23 ± 0.65 | 3.28 ± 0.61 |
 SF2 | 3.19 ± 0.76 | 3.18 ± 0.76 | 3.22 ± 0.75 |
 SF_PHYS | 15.24 ± 2.00 | 15.20 ± 2.03 | 15.31 ± 1.94 |
 SF_PSYCH | 13.85 ± 2.21 | 13.77 ± 2.26 | 14.03 ± 2.09 |
 SF_SOCIL | 14.21 ± 2.34 | 14.24 ± 2.35 | 14.15 ± 2.31 |
 SF_ENVIR | 12.46 ± 2.20 | 12.45 ± 2.22 | 12.47 ± 2.14 |