Table 1. Internal consistency and reliability of M-PSQI.
| M-PSQI | Internal consistency Cronbach’s α | Reliability | ||||
|---|---|---|---|---|---|---|
| ICC | 95%CI | Spearman correlation coefficient (p) | κ | |||
| M-PSQI Global Scores | 0.821 | 0.7 | (0.60–0.76) | 0.674a | 0.442 | |
| Subscores | ||||||
| PSQI Duration | 0.821 | 0.7 | (0.61–0.77) | 0.702a | - | |
| PSQI Disturbance | 0.723 | 0.6 | (0.45–0.66) | 0.625a | - | |
| PSQI Latency | 0.77 | 0.62 | (0.52–0.71) | 0.575a | - | |
| PSQI Daydys | 0.653 | 0.45 | (0.32–0.57) | 0.609a | - | |
| PSQI HSE | 0.64 | 0.45 | (0.32–0.56) | 0.300a | - | |
| PSQI SLPQual | 0.76 | 0.6 | (0.50–0.70) | 0.607a | - | |
| PSQIMeds | 0.8 | 0.66 | (0.56–0.74) | 0.664a | - | |
ap<0.001. M-PSQI: Pittsburgh Sleep Quality Index-Malay version; PSQI Duration: Duration of sleep; PSQI Disturbance: Sleep Disturbance; PSQI Latency: Sleep latency; PSQI Daydys: Day dysfunction due to sleepiness; PSQI HSE: Sleep Efficiency; PSQI SLPQual: Overall sleep quality; PSQIMeds: Need Medicine to sleep; ICC: Intra class Correlation; CI: confidence Interval.