Table 6

Serum sodium, urea, and creatinine in cases with and without heat cramps

	n	Mean	95% CI	Median	SD	Range	p Value
Heat cramps:
Sodium	69	141.0	140.2 to 141.8	141.0	3.4	131.0–149.0
Urea	69	7.37	6.81 to 7.93	7.10	2.38	3.30–14.9
Creatinine	69	0.144	0.132 to 0.157	0.120	0.054	0.080–0.30
No heat cramps:
Sodium	37	141.5	140.5 to 142.5	141.0	3.1	135.0–149.0	0.384
Urea	37	5.85	5.39 to 6.31	5.60	1.42	3.70–10.6	<0.001
Creatinine	37	0.108	0.100 to 0.117	0.100	0.027	0.080–0.230	<0.001