Description of sample sociodemographic characteristics
| Fatigue at 10 days | Fatigue at 1 month | Fatigue at 3 months | |||||||
| Yes | No | P value | Yes | No | P value | Yes | No | P value | |
| n (%) | n (%) | n (%) | n (%) | n (%) | n (%) | ||||
| Maternal age (years) | |||||||||
| 16–19 | 40 (2.3) | 60 (2.2) | 24 (2.0) | 76 (2.3) | 10 (1.9) | 90 (2.2) | |||
| 20–24 | 164 (9.3) | 366 (13.2) | 99 (8.1) | 431 (13.1) | 28 (5.4) | 502 (12.5) | |||
| 25–29 | 475 (27.0) | 742 (26.8) | 263 (21.4) | 954 (28.9) | 120 (23.2) | 1097 (27.3) | |||
| 30–34 | 634 (36.1) | 939 (33.9) | 477 (38.8) | 1096 (33.2) | 192 (37.1) | 1381 (34.4) | |||
| 35–39 | 347 (19.7) | 522 (18.8) | 279 (22.7) | 590 (17.9) | 114 (22.0) | 755 (18.8) | |||
| 40+ | 98 (5.6) | 143 (5.2) | 87 (7.1) | 154 (4.7) | 54 (10.4) | 187 (4.7) | |||
| Total | 1758 (100.0) | 2772 (100.0) | ** | 1229 (100.0) | 3301 (100.0) | *** | 518 (100.0) | 4012 (100.0) | *** |
| Index of Multiple Deprivation | |||||||||
| 1 | 373 (21.2) | 524 (18.9) | 285 (23.2) | 612 (18.5) | 129 (25.0) | 768 (19.1) | |||
| 2 | 334 (19.0) | 525 (18.9) | 273 (22.2) | 586 (17.7) | 97 (18.8) | 762 (19.0) | |||
| 3 | 377 (21.4) | 550 (19.8) | 244 (19.9) | 683 (20.7) | 113 (21.9) | 814 (20.3) | |||
| 4 | 366 (20.8) | 602 (21.7) | 234 (19.1) | 734 (22.2) | 109 (21.1) | 859 (21.4) | |||
| 5 (most deprived) | 308 (17.5) | 572 (20.6) | 192 (15.6) | 688 (20.8) | 69 (13.3) | 811 (20.2) | |||
| Total | 1758 (100.0) | 2773 (100.0) | * | 1228 (100.0) | 3303 (100.0) | *** | 517 (100.0) | 4014 (100.0) | ** |
| Ethnicity | |||||||||
| White | 1443 (83.3) | 2270 (84.4) | 1041 (85.9) | 2672 (83.2) | 434 (84.8) | 3279 (83.8) | |||
| Mixed | 35 (2.0) | 52 (1.9) | 28 (2.3) | 59 (1.8) | 12 (2.3) | 75 (1.9) | |||
| Asian | 194 (11.2) | 248 (9.2) | 106 (8.7) | 336 (10.5) | 43 (8.4) | 399 (10.2) | |||
| Black | 48 (2.8) | 110 (4.1) | 29 (2.4) | 129 (4.0) | 18 (3.5) | 140 (3.6) | |||
| Other | 12 (0.7) | 11 (0.4) | 8 (0.7) | 15 (0.5) | 5 (1.0) | 18 (0.5) | |||
| Total | 1732 (100.0) | 2691 (100.0) | * | 1212 (100.0) | 3211 (100.0) | * | 512 (100.0) | 3911 (100.0) | |
| Left full-time education aged <16 years | |||||||||
| No | 1525 (87.4) | 2198 (80.4) | 1068 (87.8) | 2655 (81.4) | 450 (87.5) | 3273 (82.5) | |||
| Yes | 220 (12.6) | 537 (19.6) | 149 (12.2) | 608 (18.6) | 64 (12.5) | 693 (17.5) | |||
| Total | 1745 (100.0) | 2735 (100.0) | *** | 1217 (100.0) | 3263 (100.0) | *** | 514 (100.0) | 3966 (100.0) | ** |
| Parity | |||||||||
| Primiparous | 973 (56.4) | 1232 (45.6) | 672 (55.9) | 1533 (47.5) | 247 (48.4) | 1958 (50.0) | |||
| Multiparous | 752 (43.6) | 1470 (54.4) | 531 (44.1) | 1691 (52.5) | 263 (51.6) | 1959 (50.0) | |||
| Total | 1725 (100.0) | 2702 (100.0) | *** | 1203 (100.0) | 3224 (100.0) | *** | 510 (100.0) | 3917 (100.0) | |
*p<0.05, **p<0.01, ***p<0.001.