Table 3. Comparison of pain between the mefenamic acid and exercise group in the first cycle.

Pain	Mefenamic acid	Exercise	p-value
Pain intensity, cm	39.0±17.8 (34.46–43.56)	45.4±19.2 (40.50–50.34)	0.058
Pain duration, days	1.4±0.6 (1.2–1.6)	1.6±0.8 (1.38–1.79)	0.131
Pain reduction between baseline and the second cycle, mean (SE)	16.0 (2.2)	14.8 (2.5)	0.724
Severity of dysmenorrhea, n (%)			0.475
Mild	22 (52.4)	20 (47.6)
Moderate	35 (51.5)	33 (48.5)
Severe	4 (33.3)	8 (66.7)

Data given as mean ± SD and (95% confidence interval for mean) unless otherwise stated. SE: standard error.