Table 3

Volume, sperm count and motility in the four groups of clinic volunteers

	N	Quartiles			K–W/χ²
	N	25	50	75	p Value
Volume
Controls	64	1.7	2.4	3.3	0.29
Asymptomatic NSU	27	1.4	2.0	3.2
Symptomatic NSU	19	2.1	3.0	3.7
Symptomatic non-NSU	7	2.2	2.4	3.4
Sperm count
Controls	64	45	108	205	0.015
Asymptomatic NSU	27	33	77	143
Symptomatic NSU	19	70	153	267
Symptomatic non-NSU	7	144	198	361
Motility
Controls	64	58	72	80	0.11
Asymptomatic NSU	27	64	72	81
Symptomatic NSU	19	55	67	82
Symptomatic non-NSU	7	79	81	83
Sperm concentration
Controls	64	21	49	85	0.11
Asymptomatic NSU	27	13	37	60
Symptomatic NSU	19	20	47	121
Symptomatic non-NSU	7	51	83	114
Percentage of abnormal forms
Controls	64	86	88	89	0.18
Asymptomatic NSU	27	87	88	89
Symptomatic NSU	19	87	89	90
Symptomatic non-NSU	7	86	87	87
Percentage of non-progressors
Controls	64	15	19	27	0.41
Asymptomatic NSU	27	12	20	27
Symptomatic NSU	19	10	16	21
Symptomatic non-NSU	7	7	16	27

Volume in millilitres, total sperm count in millions, motility as percentage and sperm concentration as number per millilitre.
NSU, non-specific urethritis; N, number of patients; K–W, Kruskall–Wallis test, used for top four parameters; χ², used for bottom two parameters.