Any breastfeeding for longer than one month was associated with a reduced risk of habitual snoring at age 8 ( adjusted OR 0.48 , 95 % CI 0.29 to 0.81 ) and duration of breastfeeding was inversely associated with the prevalence of habitual snoring ( adjusted OR 0.79 , 95 % CI 0.62 to 1.00 ) .