Table 5.

Odds ratio (OR) of headache type and their 95% confidence intervals (CIs) for each factor and lag dose adjusted for all other factors using generalized estimating equations (GEE)

Parameter	Exp (B)	95% CI for Exp (B)		p-value	Correlation structure	QIC	QICC
		Lower	Upper
Migraine type
Lag_6	1.106E-38	4.548E-69	2.690E-08	0.01	AR1	1346.608	1341.171
Lag_6	3.988E-46	8.918E-83	1.784E-09	0.02	Exchangeable	1347.436	1341.779

Adjusted by age, body-mass index (BMI), vision, anxiety, depression, Pittsburg sleep quality index (PISQ), internet use, hand free use, and brand device.

QIC = Quasi likelihood under an Independence Model Criterion; QICC = Corrected QIC; AR1 = auto regression 1