Table. 5. Comparison of the visual analogue scale (VAS) scores based on the duration of the illness.

Duration of illness	Number of patients (n)	First visit	Final visit	P-value*
≤ 1 week	2	10.0 ± 0.00†	4.00 ± 0.70	0.705
1 week ─ 1 month	5	10.0 ± 0.00	5.00 ± 1.80
1 ─ 6 months	8	10.0 ± 0.00	3.18 ± 2.41
≥ 6 months	5	10.0 ± 0.00	4.30 ± 3.58

*Wilcoxon signed rank test, P < 0.05; †mean ± SD.