Table 2.

Metaregression (inverse variance weights, n = 9).

Var.	Coeff.	Std. Err.	P value	95% Conf. Interval
Year	−0.0216	0.0402	0.61	(−0.1200, 0.0767)
Age	−0.0174	0.0068	0.045	(−0.0342, −0.0005)
Gender	2.00e − 04	0.5342	1	(−1.3070, 1.3076)
Sample size	2.08e − 07	5.20e − 07	0.702	(−1.06e − 06, 1.48e − 06)
Follow-up duration	0.0721	0.0223	0.018	(0.017, 0.1269)
NOS score	0.2493	0.131	0.106	(−0.0712, 0.5698)
SAHS diagnosis	−0.1417	0.234	0.567	(−0.7145, 0.4310)
Country	0.4266	0.126	0.015	(0.1182, 0.7350)

NOS: Newcastle-Ottawa Scale; SAHS: sleep apnea hypopnea syndrome.