Characteristics of first-time fathers of advanced age: a Norwegian population-based study

Table 3 Explained variance (R2% by Nagelkerke) of having the first baby at an advanced and very advanced paternal age; 35-39 years vs ≥40 years, compared with men aged 25-34 years in four blocks of exposure variables ^a

	Explained variance of each block		Cumulative explained variance
	35-39 yrs	≥40 yrs	35-39 yrs	≥40 yrs
Block^b	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.

ISSN: 1471-2393