Table 8.

Summary of univariable and multivariable logistic regression analyses predicting the incidence of back pain in boys and girls

Variable	Univariable analyses				Multivariable analyses
	P	Odds ratio	95% confidence interval	Nagelkerke’s pseudo-R2	P	Odds ratio	95% confidence interval
Boys
Dysfunctional coping	0.002	1.61	1.19–2.18	0.036	0.022	1.44	1.06–1.97
Pain catastrophizing	0.785	1.07	0.66–1.72	0.024	–	–	–
Anxiety sensitivity	0.001	1.61	1.21–2.15	0.036	0.012	1.47	1.09–1.99
Somatosensory amplification	0.030	1.35	1.03–1.77	0.029	0.187	1.22	0.91–1.62
Girls
Dysfunctional coping	0.131	1.30	0.92–1.83	0.026	0.392	1.36	0.68–2.72
Pain catastrophizing	0.068	0.63	0.39–1.03	0.015	0.015	0.51	0.30–0.88
Anxiety sensitivity	0.291	0.86	0.65–1.14	0.022	–	–	–
Somatosensory amplification	0.044	1.36	1.01–1.83	0.026	0.035	1.78	1.04–3.05

Notes: Nagelkerke’s pseudo-R² for the multivariable analyses in boys: R²=0.049; for girls R²: =0.036.