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Table 4 Correlation between PSQI items and job-related variables

From: Quality of sleep in a sample of Egyptian medical residency

Variables Duration of residency Days off Monthly shifts
R P value R P value R P value
PSQI-duration − 0.140 0.089 − 0.054 0.508 0.205 0.012*
PSQI-disturbance 0.082 0.317 0.205 0.012* − 0.121 0.139
PSQI-latency 0.185 0.024* 0.164 0.045* 0.236 0.004*
PSQI-day dysfunction − 0.108 0.187 0.207 0.011* 0.258 < 0.001**
PSQI- Habitual sleep efficiency − 0.002 0.979 − 0.076 0.357 − 0.024 0.770
PSQI-quality − 0.078 0.343 − 0.103 0.210 0.208 0.011*
PSQI-medication intake − 0.105 0.200 0.039 0.637 0.176 0.031*
PSQI-total − 0.044 0.597 − 0.030 0.715 0.157 0.055
  1. *indicates the presence of significance **indicates highly significance. R correlation coefficient