Characteristic | Number | Birth length (cm) | p value | ||||
---|---|---|---|---|---|---|---|
mean (SD) | 95% CI | ||||||
Delivery site | |||||||
Home | 219 | 50.9 (2.9) | 50.5, 51.3 | 0.001* | |||
Hospital | 411 | 50.0 (1.9) | 49.9, 50.2 | ||||
Maternal marital status | |||||||
Unmarried | 82 | 49.9 (2.5) | 49.3, 50.4 | 0.10* | |||
Married | 563 | 50.4 (2.3) | 50.2, 50.6 | ||||
Maternal age | |||||||
<20 | 27 | 50.1 (1.3) | 49.6, 50.6 | 0.01† | |||
20–24 | 164 | 50.0 (2.1) | 49.7, 50.3 | ||||
25–29 | 183 | 50.2 (2.1) | 49.9, 50.5 | ||||
30–34 | 150 | 50.4 (2.4) | 50.0, 50.8 | ||||
>35 | 121 | 50.8 (2.7) | 50.3, 51.3 | ||||
Maternal parity | |||||||
0 | 255 | 49.8 (2.2) | 49.5, 50.1 | 0.001† | |||
1 | 151 | 50.6 (1.9) | 50.3, 50.9 | ||||
2–3 | 148 | 50.6 (2.1) | 50.3, 51.0 | ||||
4+ | 91 | 50.8 (3.2) | 50.1, 51.5 | ||||
Parental social group | |||||||
1 | 19 | 50.6 (1.8) | 49.7, 51.5 | 0.05‡ § | |||
2 | 50 | 50.5 (2.2) | 49.9, 51.1 | ||||
3 | 110 | 50.9 (2.1) | 50.5, 51.3 | ||||
4 | 219 | 50.1 (2.3) | 49.8, 50.5 | ||||
5 | 228 | 50.2 (2.2) | 49.9, 50.5 | ||||
missing | 19 | 49.5 (4.0) | 47.6, 51.4 |
95% CI = 95% confidence intervals, *two samplet test, †test for trend (as continuous variable), ‡Spearman trend test, §missing values not included in trend test.