Comparison between two growth curves for small for gestational age diagnosis

In a retrospective study, data of 20,567 singleton live births from January 2003 to June 2014 were analyzed, and divided according to gestational age: (a) 23 to 26, (b) 26 to 29, (c) 29 to 32, (d) 32 to 35, (e) 35 to 38, (f) 38 to 41 and (g) >41 weeks. Data were paired and analyzed using the McNemar test, with the level of significance set at 0.05.

RESULTS:

The curve designed by Alexander indicated a higher percentage of diagnosis of SGA than the curve constructed by Fenton for every category of gestational age up to 41 weeks, more markedly in the 32-35 week group (18.5%). Between 37 and 40 weeks of gestational age, Alexander's curve exceeded Fenton's curve in 9.1% of the cases in the diagnosis of SGA.

CONCLUSIONS:

The Fenton curve provides a more accurate evaluation of an infant's growth since it is gender-specific and allows measurement of three parameters. It has also been constructed with newer data and more sophisticated statistical tools.

Fetal growth retardation; Infant, small for gestational age; Birth weight; Prenatal diagnosis

IG	Alexander <p10	Fenton <p10	Diferença %
23–26	17,8	16,8	1,0
26–29	35,2	28,5	6,7
29–32	41,5	23,6	17,9
32–35	44,1	25,6	18,5
35–38	35,2	20,0	15,2
38–41	18,8	14,2	4,6
>41	10,1	27,3	−17,2
37–40	24,3	15,2	9,1

Idade gestacional (semanas)	Número de RN	Estatística (χ²)	Valor p
23–26	185	0,7	0,4
26–29	421	28,0	<0,01
29–32	670	120,0	<0,01
32–35	1.421	263,0	<0,01
35–38	6.725	1021,0	<0,01
38–41	10.562	350,9	<0,01
Acima de 41	583	100,0	<0,01

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[1] Correspondência Fernanda Pipitone Rodrigues Avenida Doutor Eneas de Carvalho Aguiar, 255 – Cerqueira César CEP: 05403-010 São Paulo (SP), Brasil