Table 2. General characteristics by coffee intake in healthy adult males with below and above 75% of recommended calcium intake.

Variables	< 75% of recommended Ca intake			≥ 75% of recommended Ca intake
	non-coffee (N = 39)	< 1 serving coffee a day (N = 87)	≥ 1 serving coffee a day (N = 33)	non-coffee (N = 51)	< 1 serving coffee a day (N = 92)	≥ 1 serving coffee a day (N = 28)
Age, yr	22.21 ± 2.49†	22.29 ± 2.48†	22.48 ± 1.89*	22.80 ± 2.59	22.55 ± 2.30	23.18 ± 2.14
Height, cm	173.77 ± 4.36	174.90 ± 6.13	174.79 ± 3.97	174.31 ± 4.86	175.28 ± 5.33	174.50 ± 3.97
Weight, kg	67.90 ± 7.32	68.17 ± 9.99	68.94 ± 8.05	67.86 ± 7.99	68.76 ± 8.88	71.11 ± 9.62
BMI, kg/m2	22.47 ± 2.17	22.24 ± 2.74	22.55 ± 2.32	22.31 ± 2.27	22.35 ± 2.51	23.30 ± 2.67
Doing regular exercise, %	28.21	25.29	37.50	33.33	34.78	42.86
Sleep duration, hr/day	7.08 ± 1.29	7.23 ± 1.14	7.36 ± 1.09	6.84 ± 1.01	6.90 ± 1.14	6.80 ± 0.90

Mean ± S.D.

^*,†Values with different superscripts within a row are significantly different at p < 0.05 as determined by Duncan's multiple range test.