Table 2. Linear regression analysis of maternal deodorant use on maternal genotype (recessive model) adjusted for five confounders (N=4,903).

		B	95% Confidence interval		P-value	Group P-value
Maternal	25–29	−0.06	−0.22	0.10	0.475
age	30+	−0.41	−0.57	−0.24	1.7 × 10−6	2.6 × 10−10
Maternal	Medium	0.05	−0.09	0.19	0.472
education	High	−0.23	−0.37	−0.09	0.002	2.3 × 10−5
Social	III	0.02	−0.09	0.14	0.679
class	IV+V	−0.03	−0.21	0.14	0.705	0.776
Housing	Council	−0.26	−0.46	−0.05	0.013
tenure	Other	−0.36	−0.55	−0.17	2.2 × 10−4	1.5 × 10−4
Hygiene	Medium	0.40	0.28	0.53	2.3 × 10−10
	High	0.57	0.44	0.70	2.1 × 10−18	4.1 × 10−18
Genotype	AA	−1.69	−2.08	−1.30	2.1 × 10−17

Hygiene of the mother and partner was estimated in two different ways. For the mother, how often she washed the child (face, hands, and body) was considered, whereas for the partner how often he helped with washing clothes, dinnerware, and utensils was considered. No data were available on how often the parents washed themselves. Reference categories were as follows: <25 for maternal age, low education, paternal social classes I+II, mortgaged/owned, low hygiene, and GG+GA for maternal genotype. Group P-values represent a 2 d.f. statistic testing that both parameters for a particular confounder were zero. Analysis restricted to mothers of white ethnic origin.