Table V.

Semen variables of the men in the cohort B, who participated at all ages.

Age (years)	19	21	25	29	P-value*
n	52	52	52	52
Volume (ml)	3.8 (3.8) 1.1–8.7	3.8 (4.0) 0.4–10.9	4.0 (4.1) 1.6–8.9	3.4 (3.9) 0.8–7.9	0.94 19y versus 21y 0.86 19y versus 25y 1.00 19y versus 29y 1.00 21y versus 25y 0.93 21y versus 29y 0.86 25y versus 29y
Concentration (million/ml)	54 (65) 0–266	59 (61) 0–160	57 (56) 0–153	69 (74) 0–160	0.99 19y versus 21y 0.56 19y versus 25y 0.12 19y versus 29y 0.53 21y versus 25y 0.03 21y versus 29y 0.005 25y versus 29y
Total count (million)	202 (233) 0–701	192 (229) 0–928	193 (222) 0–1362	233 (280) 0–1077	1.00 19y versus 21y 0.72 19y versus 25y 0.16 19y versus 29y 0.79 21y versus 25y 0.13 21y versus 29y 0.02 25y versus 29y
Motility (abc, %)	76 (74) 47–88	82 (78) 21–93	83 (79) 44–92	82 (78) 18–94	0.04 19y versus 21y 0.05 19y versus 25y 0.20 19y versus 29y 1.00 21y versus 25y 0.99 21y versus 29y 1.00 25y versus 29y
Normal morphology (%)	7.3 (7.6) 0–19 n= 51	8.5 (8.4) 0–19 n= 49	8.0 (8.5) 1–21 n= 49	9.0 (9.7) 0–20.5 n= 51	0.22 19y versus 21y 0.59 19y versus 25y 0.001 19y versus 29y 0.91 21y versus 25y 0.04 21y versus 29y 0.02 25y versus 29y
Total motile count (million)	142 (173) 0–558	161 (183) 0–711	153 (180) 0–1034	193 (192) 0–979	1.00 19y versus 21y 0.92 19y versus 25y 0.005 19y versus 29y 0.81 21y versus 25y 0.04 21y versus 29y 0.007 25y versus 29y

P-value <0.05 is considered significant, shown in bold. Results are shown as median (mean) and range. Mixed model of repeated measures analyses following a square root transformation was used. P-values for pairwise comparisons were adjusted using the Tukey–Kramer methods. For other adjustments see statistical methods.