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Table 2 Risk for small-for-gestational-age (SGA) birth associated with severe nausea and vomiting in early pregnancy (NVP)

From: Relationship between hyperemesis gravidarum and small-for-gestational-age in the Japanese population: the Japan Environment and Children’s Study (JECS)

 

Total number

No data on birth n (%)

Non-SGA birth n (%)

SGA birth n (%)

Crude

Confounder-adjusted

RR

95 % CI

RR

95 % CI

Severe NVP

880

48 (5.5)

773 (87.8)

59 (6.7)

0.98

0.75–1.27

0.86

0.62–1.19

No severe NVPa

7563

420 (5.6)

6625 (87.6)

518 (6.8)

(1.0)

 

(1.0)

 

No data on NVP state

188

15 (8.0)

164 (87.2)

9 (4.8)

    
  1. The crude and adjusted risk ratios calculated using covariates such as the mother’s age, pre-pregnancy body mass index, weight gain during pregnancy, parity, smoking and alcohol consumption status, education, and income, to determine the effect of severe NVP on the risk of SGA birth
  2. RR risk ratio, CI confidence interval
  3. aUsed as reference in the calculation of risk ratios