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Table 2 The effect of poor sleep on headache frequency and headache intensity

From: Comorbidity of poor sleep and primary headaches among nursing staff in north China

Sleep

Headache frequency (episodes/month)

Headache intensity

≤2

>2

OR (95%CI)

VAS ≤ 4

VAS ≥ 4

OR (95%CI)

   

1.48 (0.99–2.2)

  

1.72 (1.14–2.57)

Normal sleepers (N%)

91 (61.5 %)

57 (38.5 %)

 

98 (66.2 %)

50 (33.8 %)

 

Poor sleepers (N%)

163 (51.9 %)

151 (48.1 %)

 

168 (53.3 %)

147 (46.7 %)