Hierarchical multiple regression analyses using two steps.

Men (n = 192) The first step contained the adjusting variables age, years of experience as nurse, married/cohabiting (0 = no, 1 = yes) and children living at home (0 = no, 1 = yes), while the second step included number of night shifts in the last 12 months. Total scores on anxiety (HADS-A), depression (HADS-D), insomnia (BIS), sleepiness (ESS) and fatigue (FQ) were used as dependent variables. Anxiety, depression and insomnia variables were transformed using square root transformation before they were entered into the model. Results are reported as standardized beta-coefficients (β) and the R square changes (ΔR2) (n = 2035). Analyses are stratified for (1) men and women and (2) night work experience less than three years vs. at least three years.HADS = Hospital Anxiety and Depression Scale (A = anxiety subscale, D = depression subscale).BIS = Bergen Insomnia Scale.ESS = Epworth Sleepiness Scale.FQ = Fatigue Questionnaire.*p