Table 6. Pearson's correlation coefficient between sociodemographic and clinical characteristics in relation to Work Productivity and Activity Impairment - General Health (WPAI-GH) questionnaire scales.

		WPAI-GH scales
Sociodemographic and clinical characteristics	Work time missed (%)	Impairment at work (%)	Overall work productivity loss (%)	Activity impairment (%)
Gender
Pearson's correlation	-0.12	0.096	0.009	0.322
p-value	0.233	0.341	0.928	0.001*
Age
Pearson's correlation	0.032	0.15	0.127	0.116
p-value	0.753	0.137	0.208	0.251
Education
Pearson's correlation	0.004	-0.163	-0.136	0.269
p-value	0.968	0.104	0.177	0.007†
Years of education
Pearson's correlation	0.035	-0.198	-0.151	-0.299
p-value	0.732	0.049‡	0.134	0.003†
Length of employment
Pearson's correlation	0.128	0.099	0.133	0.039
p-value	0.203	0.328	0.187	0.699
Hours of work per week
Pearson's correlation	0.013	0.317	0.261	0.291
p-value	0.901	0.001*	0.009†	0.003†
Monthly wage
Pearson's correlation	0.200	-0.057	0.046	0.133
p-value	0.046‡	0.576	0.65	0.188
Absenteeism
Pearson's correlation	0.511	0.19	0.323	0.066
p-value	0.00*	0.058	0.001*	0.517
Missing days from work
Pearson's correlation	0.405	0.134	0.238	0.080
p-value	0.000*	0.183	0.017‡	0.429
Health interference with job functioning
Pearson's correlation	0.137	0.315	0.325	0.125
p-value	0.173	0.001*	0.001*	0.217
Intensity of the interference
Pearson's correlation	-0.169	-0.544	-0.509	-0.455
p-value	0.142	0.000*	0.00*	0.000*
Symptom duration
Pearson's correlation	0.066	0.065	0.086	0.189
p-value	0.513	0.518	0.393	0.059
Current medication
Pearson's correlation	-0.130	-0.067	-0.118	-0.023
p-value	0.196	0.505	0.242	0.821

^* = p < 0.001;

^† = p < 0.01;

^‡ = p < 0.05.