Table 5. The quality of sleep and prolactin concentration in daytime nurses and midwives
Characteristics Premenopausal women Postmenopausal women
β-coefficient* SE P β-coefficient* SE P
Sleep time (average, within last four
weeks) (hours)
-0.050 0.029 0.085 0.037 0.037 0.321
Sleep time during the night before
blood sampling (hours) 0.014 0.016 0.376 0.043 0.030 0.153
Number of awakenings during the night
before blood sampling -0.032 0.032 0.326 -0.005 0.045 0.908
*adjusted for: time of blood sampling (hour), cigarette smoking within 24 h before blood sampling (Yes/No), calendar season when blood sample was collected (July-September/October-June), parity with breastfeeding(nulliparous, parous who breastfed, parous who never breastfeed); in addition among postmenopausal women age and age at menopause