Table 4: Descriptive analysis of study population by center.

Center
ABCDEFGHILMOverall

Deliveries, 129195095717911328164210548682745579252115726
MA, yrs*31.8 ± 5.031.7 ± 5.431.2 ± 5.331.7 ± 5.431.3 ± 5.131.8 ± 5.031.1 ± 5.231.6 ± 5.232.3 ± 5.131.8 ± 5.131.8 ± 5.431.7 ± 5.2
GA, wks ± days39 ± 139 ± 139 ± 138 ± 639 ± 239 ± 139 ± 039 ± 239 ± 039 ± 038 ± 439 ± 0
GA, wks-range**26–4232–4233–4226–4234–4229–4224–4228–4224–4233–4221–4221–42
BW, grams*3324 ± 4693276 ± 4523337 ± 451 3277 ± 531 3362 ± 447 3325 ± 481 3321 ± 460 3315 ± 493 3301 ± 560 3310 ± 443 3256 ± 631 3304 ± 520
PMR, (%)1 (0.1)0 (0)1 (0.1)8 (0.5)3 (0.2)4 (0.3)2 (0.2)1 (0.1)15 (0.6)0 (0)16 (0.6)51 (0.3)
CD rate, (%)184 (14.3)281 (29.6)266 (27.8)519 (29.0)255 (19.2)285 (17.4)230 (21.8)158 (18.2)598 (21.8)156 (26.9)859 (34.1)3791 (24.1)
CD, 95% 12.4–16.326.7–32.625.0–30.826.9–31.117.1–21.415.6–19.319.4–24.415.7–20.920.3–23.423.4–30.832.2–36.023.4–24.8

 *ANOVA’s for all the variables; **Kruskal-Wallis’s ; -squared ; Fisher exact test .
MA: maternal age; GA: gestational age at delivery; Wks: weeks; BW: birthweight; PMR: perinatal mortality rate; CD: caesarean delivery; CI: confidence intervals. Maternal age, gestational age, and birthweight are expressed as mean ± standard deviation.