Table 3

Absolute and relative risk (using the highest parental birth weights as reference) of low birth weight in offspring by combination of maternal and paternal weight categories

Categories of maternal birth weight (g)Categories of paternal birth weight (g)Low birth weight in childAbsolute risk (%)Relative risk
YesNo
<2500<2500135419.48.2
<25002500–2999181888.73.7
<25003000–3499666549.23.9
<25003500–3999747608.93.8
<25004000+383829.03.8
2500–2999<25002622910.24.3
2500–29992500–2999608566.62.8
2500–29993000–349920826657.23.1
2500–29993500–399919232865.52.3
2500–29994000+9018464.62.0
3000–3499<2500406316.02.5
3000–34992500–299913222725.52.3
3000–34993000–349935174354.51.9
3000–34993500–399937590794.01.7
3000–34994000+19350403.71.6
3500–3999<2500265374.62.0
3500–39992500–29997019403.51.5
3500–39993000–349921463813.21.4
3500–39993500–399921481842.51.1
3500–39994000+12246422.61.1
4000+<250071953.51.5
4000+2500–2999186922.51.1
4000+3000–34995623742.31.0
4000+3500–39995830791.80.9
4000+4000+4116922.41.0