Performances of birthweight charts to predict adverse perinatal outcomes related to SGA in a cohort of nulliparas

Table 3 Odds Ratio for maternal and neonatal outcomes among SGA neonates and their mothers (assuming different centile thresholds) compared with the reference group with a birth weight between 40^th-60^th centiles according to each chart

Adverse outcomes and centile thresholds	Birth in Brazil OR (95%CI)	GROW-Customised OR (95%CI)	Intergrowth-21^st OR (95%CI)	WHO-FGC OR (95%CI)
All caesarean section
< p5	0.41 [0.21 – 0.81]	0.56 [0.30 – 1.06]	0.51 [0.27 – 1.00]	0.47 [0.24 – 0.93]
< p10	0.62 [0.38 – 1.02]	0.53 [0.32 – 0.87]	0.57 [0.34 – 0.93]	0.56 [0.34 – 0.93]
< p15	0.61 [0.40 – 0.95]	0.55 [0.35 – 0.84]	0.55 [0.35 – 0.85]	0.64 [0.41 – 0.99]
Need for NICU admission
< p5	1.24 [0.47 – 3.27]	1.26 [0.44 – 3.61]	1.34 [0.50 – 3.57]	1.83 [0.71 – 4.72]
< p10	1.01 [0.45 – 2.25]	1.28 [0.56 – 2.94]	1.22 [0.55 – 2.68]	1.42 [0.63 – 3.19]
< p15	1.01 [0.50 – 2.05]	1.19 [0.56 – 2.52]	1.04 [0.50 – 2.15]	1.08 [0.50 – 2.33]
Neonatal morbidity
< p5	1.37 [0.36 – 5.25]	1.13 [0.23 – 5.62]	0.97 [0.20 – 4.74]	1.32 [0.26 – 6.74]
< p10	0.89 [0.27 – 2.98]	0.86 [0.22 – 3.39]	0.97 [0.29 – 3.32]	1.70 [0.51 – 5.72]
< p15	0.74 [0.24 – 2.25]	0.76 [0.22 – 2.64]	0.82 [0.26 – 2.57]	1.11 [0.33 – 3.70]

Abbreviations: CI Confidence interval, NICU Neonatal intensive care unit, OR Odds ratio. Values in bold are statistically significant

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