Table 3

Explained variance (R2% by Nagelkerke) of having the first baby at anadvancedandvery advancedpaternal age; 35-39 years vs ≥40 years, compared with men aged 25-34 years in four blocks of exposure variablesa
Explained variance of each block Cumulative explained variance
35-39 yrs ≥40 yrs 35-39 yrs ≥40 yrs
Blockb R2 R2 R2 R2
Sociodemographics 6.6 7.8 6.6 7.8
Health behaviour, physical and mental problems 4.0 6.8 10.5 14.3
Planning of pregnancy 2.7 2.7 12.5 16.5
Social relationships 0.5 1.7 12.8 17.4

aBlocks entered either as first block (Explained variance of each block) or in sequential order (Cumulative explained variance).

bVariables in each block as in Table 2.

Nilsen et al.

Nilsen et al. BMC Pregnancy and Childbirth 2013 13:29   doi:10.1186/1471-2393-13-29

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