Table 1: Absence of association between other variables and back pain severity

Variable	Present	N	Back pain severity (0 – 10)	p-valuea
Demographics
Age	-	-	Spearman’s rho = - 0.01	0.95
BMI	-	-	Spearman’s rho = 0.23	0.07
Parous	Yes	24	4.8 +/- 3.1	0.82
	No	38	4.9 +/- 3.1
History of trauma to the pelvis	Yes	29	5.4 +/- 2.9	0.17
	No	32	4.4 +/- 3.1
Endometriosis
Laparoscopically diagnosed	Yes	23	5.5 +/- 3.2	0.19
	No	40	4.6 +/- 3.0
Symptoms	Yes	53	4.8 +/- 3.2	0.72
	No	6	5.6 +/- 2.4
Non-dysmenorrhea chronic pelvic pain	Yes	56	5.1 +/- 3.0	0.64
	No	4	4.0 +/- 4.2
Superficial dyspareunia	Yes	31	5.1 +/- 3.2	0.70
	No	17	4.7 +/- 3.1
Deep dyspareunia	Yes	44	5.3 +/- 3.3	0.25
	No	8	4.1 +/- 1.7
Bowel symptoms	Yes	46	5.4 +/- 3.0	0.07
	No	17	3.7 +/- 3.0
Bladder symptoms	Yes	43	5.2 +/- 3.0	0.44
	No	20	4.4 +/- 3.2
Signs
Abdominal wall pain	Yes	50	4.8 +/- 3.0	0.60
	No	12	5.3 +/- 3.4
Bladder base tenderness	Yes	26	4.7 +/- 2.5	0.42
	No	35	5.1 +/- 3.3
Pelvic floor tenderness	Yes	33	4.9 +/- 2.7	0.71
	No	28	5.0 +/- 3.4

^aAll associations tested with the Mann-Whitney test, except for Spearman rank correlation for age and BMI