Table 4.

Regression of proportion informal activities on year of measurement and explanatory variables

	Model I	Model II	Model III	Model IV
Year of measurement	.004**	−.000	.005**	.002**
Cohorts
Until 1930 (reference)
1931–1945		V
1946–1960		V
1961–1975		V
From 1976		V
Age			V
Age2 (/100)			V
Education				V
Change coefficient (%)	–	−102%	+25%	−44%

~ p < .10; * p < .05; ** p < .01