Multivariate analysis assessed the simultaneous influence of maternal educational level, any informal parenting support and any formal parenting support on attitudes and organisation. (gov.scot)
Both studies considered as covariates of child gender, ethnicity and birth weight, maternal educational level, maternal smoking and alcohol use, and family income. (ebmh.bmj.com)
We included the covariates: age, gender, alcohol consumption in the previous month, lifetime use of cannabis, lifetime sexual abuse, repeated school years, maternal educational level and single - parent family. (capmh.biomedcentral.com)