Table 1. Baseline characteristics in each group of maternal age.
| Outcomes | Maternal age (years) | Overall | P-value | P-value for Trend | ||
|---|---|---|---|---|---|---|
| 15–20 | 21–35 | 36–55 | ||||
| N | 117 | 6,199 | 1,382 | 7,698 | ||
| Maternal information, N (%) | ||||||
| Primigravida | 91/117 (77.8) | 3,408/6,158 (55.3) | 397/1,375 (28.9) | 3,896/7,650 (50.9) | <0.01 | <0.01 |
| Hypertension | 10/111 (9.0) | 1,051/6,098 (17.2) | 374/1,366 (27.4) | 1,435/7,575 (18.9) | <0.01 | <0.01 |
| Diabetes | 10/111 (9.0) | 969/6,092 (15.9) | 347/1,358 (25.6) | 1,326/7,561 (17.5) | <0.01 | <0.01 |
| Perinatal care, N (%) | ||||||
| Prenatal care | 98/105 (93.3) | 5,951/6,000 (99.2) | 1,321/1,339 (98.7) | 7,370/7,444 (99.0) | <0.01 | 0.71 |
| Cesarean section | 33/116 (28.4) | 3,407/6,177 (55.2) | 895/1,375 (65.1) | 4,335/7,668 (56.5) | <0.01 | <0.01 |
| Antenatal steroid Usage | 54/94 (57.4) | 4,404/5,637 (78.1) | 1,002/1,266 (79.1) | 5,460/6,997 (78.0) | <0.01 | 0.02 |
| Inborn | 54/117 (46.2) | 4,026/6,199 (64.9) | 895/1,382 (64.8) | 4,975/7,698 (64.6) | <0.01 | 0.17 |
| Infants characteristics | ||||||
| Gestational age, median [P25, P75] | 30.00 [28.71, 31.14] | 30.00 [28.71, 31.00] | 30.00 [28.43, 31.00] | 30 [28.57, 31.00] | 0.10 | 0.04 |
| Birth weight, mean (Std) | 1,395.32 (301.16) | 1,348.99 (308.63) | 1,322.76 (324.67) | 1,344.98 (311.64) | <0.01 | <0.01 |
| SGA, N (%) | 5/117 (4.3) | 375/6,196 (6.1) | 108/1,380 (7.8) | 488/7,693 (6.3) | 0.03 | <0.01 |
| Multiple birth, N (%) | 26/117 (22.2) | 1,969/6,199 (31.8) | 310/1,382 (22.4) | 2,305/7,698 (29.9) | <0.01 | <0.01 |
| Male, N (%) | 78/117 (66.7) | 3,536/6,196 (57.1) | 770/1,380 (55.8) | 4,384/7,693 (57.0) | 0.07 | 0.11 |
| Apgar score <7 at 5 min, N (%) | 5/105 (4.8) | 362/5,845 (6.2) | 90/1,295 (6.9) | 457/7,245 (6.3) | 0.48 | 0.24 |
| TRIPS score on admission, median [P25, P75] | 13 [7, 19] | 12 [6, 19] | 13 [6, 19] | 12 [6, 19] | 0.14 | 0.55 |
SGA, small for gestational age; TRIPS, Transport Risk Index of Physiological Stability.