A cross-sectional population-based survey of migraine and headache in 21,177 Norwegians: the Akershus sleep apnea project

Table 5 The age trends in different subgroups were assessed using the non-linear regression model for each gender separately

Dependent variable	Coefficients of regression model				P values	R ²
Dependent variable	b ₀	b ₁	b ₂	b ₃	P values	R ²
No migraine
Men
0 days	30.43	−1.12	0.02	–	<0.001	0.988
1–11 days	39.34	1.07	−0.02	–	<0.001	0.985
12–30 days	27.03	−0.30	–	–	<0.001	0.957
31–84 days	−19.05	1.94	−0.04	0.0003	<0.001	0.869
85–179 days	−15.38	1.20	−0.02	0.0001	<0.001	0.855
≥180 days	−5.54	0.40	−0.01	0.00004	0.197	0.390
Women
0 days	23.04	−1.21	0.02	–	<0.001	0.991
1–11 days	22.88	1.32	−0.016	–	<0.001	0.835
12–30 days	29.49	−0.03	−0.003	–	<0.001	0.924
31–84 days	17.41	−0.16	–	–	<0.001	0.822
85–179 days	9.20	−0.10	–	–	<0.001	0.821
≥180 days	−9.89	0.83	−0.02	0.0001	0.056	0.550
Co-occurrence of migraine
Men
0 days	11.55	−0.62	0.01	–	<0.001	0.949
1–11 days	89.72	−4.18	0.09	−0.001	0.306	0.317
12–30 days	43.30	−0.39	–	–	<0.001	0.804
31–84 days	−19.61	3.15	−0.07	0.0005	0.036	0.596
85–179 days	−2.99	0.54	−0.006	–	0.005	0.660
≥180 days	−0.004	0.20	−0.002	–	0.199	0.276
Women
0 days	21.80	−1.33	0.02	–	<0.001	0.980
1–11 days	94.78	−5.62	0.13	−0.001	<0.001	0.832
12–30 days	11.94	0.87	−0.01	–	<0.001	0.809
31–84 days	36.41	−0.29	–	–	<0.001	0.778
85–179 days	19.68	−0.20	–	–	<0.001	0.796
≥180 days	9.00	−0.06	–	–	0.037	0.338

ISSN: 1129-2377