Figure 9. Unadjusted and adjusted odds ratios of maternal grandmother smoking prenatally in regard to diagnosed autism.

All adjusted variables take account of the year of birth of the maternal grandmother, the ages of the grandparents when the study mother was born, the parity of the maternal grandmother, mother’s (F1) use of social housing, education and locus of control. [N.B. Parity was dropped from the subgroup analyses of mothers who smoked since there were no maternal grandmothers of parity 0 in this group]. Variables with P < 0.10 are in bold.