Table 2.

Volume, sodium, potassium, and creatinine excretion in four 6-h intervals starting at wake-up time, 24 h, and first morning urine (FMU) samples.

	Morning (0–6 h)		Afternoon (6–12 h)		Evening (12–18 h)		Overnight (18–24 h)		24 h		FMU
	Mean	SD	Mean	SD	Mean	SD	Mean	SD	Mean	SD	Mean	SD
Total volume (L)
Total	0.53	0.28	0.36	0.22	0.27	0.17	0.08	0.14	1.24	0.56	0.33	0.12
Male	0.52	0.27	0.36	0.23	0.27	0.18	0.08	0.13	1.21	0.54	0.33	0.13
Female	0.53	0.29	0.36	0.22	0.26	0.16	0.08	0.14	1.28	0.59	0.33	0.11
Urine Na (mg/time interval)
Total	1,018.8	690.1	821.7	704.4	551.5	439.7	55.9	166.8	2,902.9	1,344.0	693.4	507.3
Male	1,074.9	727.6	920.9	829.5	565.0	486.6	75.0*	208.4	3,028.0	1,480.4	671.4	340.6
Female	949.0	638.8	701.1*	493.0	534.0	373.4	31.8	86.8	2,759.1	1,162.3	719.1	652.2
Urine K (mg/time interval)
Total	727.2	520.2	713.5	524.5	389.2	319.1	38.1	120.5	2,215.2	1,064.1	443.4	250.6
Male	744.4	518.2	735.6	564.7	389.9	349.4	49.0	147.7	2,167.3	1,059.9	446.6	247.3
Female	705.8	525.6	686.7	473.8	388.2	277.7	24.3	72.2	2,270.9	1,074.2	439.5	256.8
Urine creatinine (mg/time interval)
Total	49.4	48.8	34.1	33.9	24.4	23.5	2.1	5.5	121.4	52.4	40.6	51.2
Male	49.1	41.6	34.0	33.2	24.2	25.6	2.8*	6.8	123.3	57.4	35.1	17.0
Female	49.6	56.8	34.2	35.0	24.7	20.5	1.2	3.2	119.2	46.1	47.7	74.9

Results are presented as mean (SD). P-values derived through Student’s t-test for differences between genders and one-way ANOVA among 6-h intervals.

*p < 0.05 indicates significant difference between males and females.