Table 2.

Distribution of grades of stress fractures in relation to treatment arms

Management	Grade of stress fracture		Total
2	3
Ultrasound treatment	25	14	39
Row%	64.1	35.9	100.0
Placebo	17	11	28
Row%	60.7	39.3	100.0
Total	42	25	67
Row%	62.7	37.3	100.0
Statistical tests		Chi-square 2 tailed p
Chi square – uncorrected		0.0800 0.7773035808
Chi square – Mantel-Haenszel		0.0788 0.7789282185
Chi square – corrected (Yates)		0.0007 0.9786554393