Table 2 Incidence of outcomes in 23,899 pregnancies grouped according to gestational interval, stratified by age of mother at current delivery
Outcome | Total | IPI, n. (%) | Z | p-value | ||||
|---|---|---|---|---|---|---|---|---|
< 18 months (n = 1577) | 18–23 months (n = 1385) | 24–59 months (n = 9093) | 60–119 months (n = 9031) | ≥ 120 months (n = 2813) | ||||
Small-for-gestational age | ||||||||
All women | 192 (0.8) | 8 (0.5) | 11 (0.8) | 66 (0.7) | 67 (0.7) | 40 (1.4) | 2.817 | 0.005 |
Maternal age, years | ||||||||
≤ 29 | 47 (1.0) | 5 (0.6) | 5 (0.9) | 16 (0.7) | 21 (2.2) | 0 (zero) | 2.816 | 0.005 |
30–34 | 81 (0.7) | 1(0.2) | 6 (0.9) | 39 (0.7) | 25 (0.6) | 10 (2.4) | 2.044 | 0.041 |
≥ 35 | 64 (0.8) | 2 (1.9) | 0(0) | 11 (0.7) | 21 (0.5) | 30 (1.3) | 1.640 | 0.100 |
Low birth weight at full term | ||||||||
All women | 245 (1.0) | 15 (1.0) | 12 (0.9) | 81 (0.9) | 89 (1.0) | 48 (1.7) | 2.533 | 0.011 |
Maternal age, years | ||||||||
≤ 29 | 52 (1.1) | 11 (1.3) | 8 (1.4) | 21 (0.9) | 11 (1.2) | 1 (7.1) | -0.342 | 0.732 |
30–34 | 8 (0.7) | 3(0.5) | 2(0.3) | 45 (0.8) | 29 (0.7) | 4 (0.9) | 0.921 | 0.357 |
≥ 35 | 110 (1.3) | 1(1.0) | 2(1.5) | 15(1.0) | 49 (1.2) | 43 (1.8) | 1.996 | 0.046 |
Premature birth | ||||||||
All women | 1818 (7.6) | 102 (6.5) | 76 (5.5) | 595 (6.5) | 740 (8.2) | 305 (10.8) | 7.360 | < 0.001 |
Maternal age, years | ||||||||
≤ 29 | 381 (8.2) | 52 (6.1) | 32 (5.5) | 177 (7.8) | 118 (12.4) | 2 (14.3) | 4.968 | < 0.001 |
30–34 | 787 (7.1) | 43 (6.9) | 38 (5.6) | 322 (6.0) | 317 (8.0) | 67 (15.8) | 5.182 | < 0.001 |
≥ 35 | 650 (7.9) | 7 (6.8) | 6 (4.5) | 96 (6.5) | 305 (7.4) | 236 (9.9) | 4.156 | < 0.001 |
Adverse neonatal composite* | ||||||||
All women | 262 (1.1) | 11 (0.7) | 10 (0.7) | 93 (1.0) | 110 (1.2) | 38 (1.4) | 2.688 | 0.007 |
Maternal age, years | ||||||||
≤ 29 | 48 (1.0) | 3 (0.4) | 4 (0.7) | 21 (0.9) | 19 (2.0) | 1 (7.1) | 3.555 | < 0.001 |
30–34 | 122 (1.1) | 7 (1.1) | 6 (0.9) | 53 (1.0) | 46 (1.2) | 10 (2.4) | 1.478 | 0.140 |
≥ 35 | 92 (1.1) | 1(1.0) | 0(0) | 19 (1.3) | 45 (1.1) | 27 (1.1) | 0.187 | 0.851 |