Table 5. Sleep quality parameters across depression severity levels.

*Statistically significant when the p-value was less than 0.05.

PSQI, Pittsburgh Sleep Quality Index

Parameters	Minimal	Mild	Moderate	Severe	p-value
Mean PSQI score (SD)	3.2 (1.8)	5.7 (2.4)	8.1 (2.9)	11.3 (3.2)	<0.001*
Sleep latency >30 min (%)	8.3	18.7	35.5	56.2	<0.001*
Sleep duration <6 h (%)	12.5	23.4	41.9	59.4	<0.001*
Sleep efficiency <85% (%)	15.6	28.1	45.2	62.5	<0.001*
Daytime dysfunction (%)	18.2	35.7	58.1	78.1	<0.001*