Comparison of the demographic and obstetric characteristics of the ELA and NELA cohorts before and after propensity score matching
| Variables | Before propensity score matching | After propensity score matching | ||||
| ELA (n=149) | NELA (n=667) | P value | ELA (n=137) | NELA (n=137) | P value | |
| Age (years) | 28.6±3.2 | 28.8±3.8 | 0.04 | 28.6±3.2 | 28.7±3.4 | 0.97 |
| Gestational age (weeks) | 39.1±1.4 | 39.3±1.8 | 0.22 | 39.1±1.3 | 39.1±1.1 | 0.90 |
| Height (cm) | 159.8±4.7 | 156.0±6.3 | 0.05 | 159.8±4.7 | 159.4±4.8 | 0.52 |
| Weight (kg) | 67.7±9.3 | 67.1±8.9 | 0.34 | 67.7±9.1 | 67.3±8.7 | 0.72 |
| BMI (kg/m2) | 26.5±3.1 | 26.7±3.2 | 0.04 | 26.4±3.1 | 26.3±3.0 | 0.80 |
| Risk factors | ||||||
| Obesity (kg/m2) | 0.08 | 0.58 | ||||
| 25.0≤BMI<29.9 | 63 (42.3) | 346 (51.9) | 56 (55.9) | 59 (55.9) | ||
| 30.0≤BMI<34.9 | 19 (12.8) | 91 (13.6) | 16 (9.0) | 15 (8.5) | ||
| BMI ≥40 | 2 (1.3) | 13 (2.0) | 1 (0.6) | 0 (0.0) | ||
| Maternal age (years) | 0.02 | 0.68 | ||||
| 18≤age<25 | 19 (12.8) | 88 (13.2) | 16 (9.0) | 14 (7.9) | ||
| 25≤age<30 | 92 (61.7) | 324 (48.6) | 87 (60.5) | 84 (58.8) | ||
| 30≤age<35 | 31 (20.8) | 206 (30.9) | 27 (26.6) | 27 (26.6) | ||
| Age ≥35 | 7 (4.7) | 49 (7.4) | 7 (4.0) | 12 (6.8) | ||
| Complications | ||||||
| Impaired glucose tolerance | 49 (32.9) | 218 (32.7) | >0.99 | 45 (32.9) | 43 (31.4) | 0.80 |
| Family history of diabetes | 83 (55.7) | 414 (62.1) | 0.16 | 81 (59.1) | 80 (58.4) | 0.90 |
| PCOS | 6 (4.0) | 41 (6.2) | 0.44 | 4 (2.9) | 4 (2.9) | >0.99 |
| History of recurrent abortions | 11 (8.0) | 45 (6.8) | 0.72 | 6 (4.4) | 6 (4.4) | >0.99 |
| History of essential or pregnancy-related hypertension, pre-eclampsia and eclampsia | 12 (8.1) | 73 (10.9) | 0.37 | 11 (8.0) | 12 (8.8) | 0.83 |
| Classification | 0.22 | 0.70 | ||||
| A1 | 131 (87.9) | 608 (91.2) | 122 (89.1) | 124 (89.1) | ||
| A2 | 18 (12.1) | 59 (8.9) | 15 (11.0) | 13 (11.0) | ||
BMI, body mass index; ELA, epidural labour analgesia; NELA, non-epidural labour analgesia; POCS, polycystic ovary syndrome.