Table 4.

Pearson product moment coefficients

FSS	Pearson product moment correlation (r)
	PSQI total score	FSS existing	PHQ-15
Chronic pelvic pain	0.036	−0.012	0.022
Tension-type headache	0.014	0.502**	0.076**
Globus	0.043	0.251**	0.074**
Irritable bowel syndrome	0.099**	0.623**	0.222**
Functional dyspepsia	0.036	0.525**	0.118**
Chronic low back pain	0.045	0.236**	0.114**
FSS existing	0.097**	1	0.242**

Note:

^**p<0.001, r>0.10 = weak, r>0.30 = moderate, r>0.50 = strong. Bold font indicates p<0.01.

Abbreviations: FSS, functional somatic syndrome; PSQI, Pittsburgh Sleep Quality Index; PHQ, Patient Health Questionnaire – German Version.