Table 2.

The subgroup analysis for the meta-analysis comparing the occurrence of insomnia between groups of adverse/normal glycaemic control

Subgroup	Number of articles	OR (95% CI), P-value	Heterogeneity (I2)
All participants suffered from T2D	1 [14]	5.67 (3.03, 10.60), P < 0.001	NA
Not all participants suffered from T2D	5 [11,17,36,62,89]	1.37 (1.15, 1.63), P < 0.001	2.0%
Total	6 [11,14,17,36,62,89]	1.87 (1.19, 2.93), P = 0.006	78.0%

CI – confidence interval, NA – not applicable, OR – odds ratio, T2D – type 2 diabetes.