Figure 2. Unadjusted and adjusted odds ratios of maternal grandmother smoking prenatally in regard to high scores on the Social Communication trait.

Variables with P < 0.10 are in bold.All adjusted variables take account of the year of birth of the maternal grandmother, the year of birth of the maternal grandfather, the age of the paternal grandmother when the study father was born, the social group of the paternal grandfather and the sex of the grandchild (where appropriate).