Table 4.

Associations of proportion of ≥12 hr shifts worked in past 7 days and sickness absence

Shift characteristics	AOR	95%CI
Proportion of ≥12 hr shifts over shifts worked in past 7 days (0% reference category)
>0–≤25	1.12	0.97–1.29
>25–≤50	1.26*	1.15–1.37
>50–≤75	1.16*	1.05–1.28
>75	1.27*	1.18–1.37
Proportion of days worked over past 7 days (25% reference category)
>25–≤50	0.91*	0.86–0.97
>50–≤75	0.77*	0.73–0.82
>75	0.66*	0.58–0.75
Proportion of night shifts over shifts worked in past 7 days (0% reference category)
>0–≤25	0.91	0.78–1.07
>25–≤50	1.11	1.00–1.23
>50–≤75	1.06	0.94–1.21
>75	1.12*	1.03–1.21
Nurse grade
Health care assistant (HCA) (Reference category)
Registered nurse (RN)	0.65*	0.58–0.73

Generalized linear mixed model; random effect: Staff ID.

*Statistically significant at p <.05.