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Table 4 Odds ratio about number of subjects who reply above 3 points at some PSQI questionnaire by group

From: The relationship between quality of sleep and night shift rotation interval

Variables Group A Group B Group C
ORa (95 % CI) OR (95 % CI) OR (95 % CI)
Q1b Referent 1.617 (1.285–1.304) 1.669 (1.304–2.136)
Q2c Referent 1.131 (0.907–1.410) 1.294 (1.020–1.643)
Q3d Referent 1.176 (0.950–1.457) 1.014 (0.804–1.279)
Q4e Referent 1.325 (1.022–1.718) 2.096 (1.596–2.752)
Q5f Referent 1.920 (1.279–2.884) 2.757 (1.815–4.187)
  1. aodds ratio, confidence interval
  2. bDuring the past month, how would you rate your sleep quality overall? (PSQI 6)
  3. cCannot get to sleep within 30 min (PSQI 5–a)
  4. dWake up in the middle of the night or early morning (PSQI 5–b)
  5. eDuring the past month, how often have you had trouble staying awake while driving, eating meals, or engaging in social activity? (PSQI 8)
  6. fDuring the past month, how much of a problem has it been for you to keep up enough enthusiasm to get things done? (PSQI 9)