Table 3. VO_2peak at 3-year follow-up by allocation: overall and by subgroups.

		Vitamin D arm: mean value, mL/kg/min (SD) (n)	Placebo arm: mean value, mL/kg/min (SD) (n)	Adjusted mean difference (95% CI)*	P value	P for interaction
Overall		37.2 (4.1) (200)	37.1 (4.1) (187)	0.24 (−0.15 to 0.63)	0.23
By sex	Male	39.0 (3.2) (95)	39.2 (3.4) (89)	−0.02 (−0.56 to 0.53)	0.95	0.22
	Female	35.5 (4.1) (105)	35.2 (3.8) (98)	0.47 (−0.06 to 1.00)	0.08
By baseline 25(OH)D concentration†	<25 nmol/L	36.6 (4.5) (103)	36.7 (3.9) (95)	0.50 (−0.06 to 1.06)	0.08	0.28
	≥25 nmol/L	37.7 (3.9) (59)	37.5 (4.2) (54)	−0.01 (−0.75 to 0.74)	0.98
By calcium intake	<median‡	37.5 (3.7) (92)	37.4 (4.3) (97)	0.19 (−0.32 to 0.70)	0.47	0.87
	≥median‡	36.8 (4.5) (102)	36.6 (4.0) (87)	0.25 (−0.36 to 0.87)	0.42

^*Adjusted for baseline value and school of attendance.

^†Serum 25(OH)D₃ concentrations deseasonalised.

^‡Median value 466 mg/day.

25(OH)D₃25(OH)D₃, 25-hydroxyvitamin D₃