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Table 3 Results of meta-analysis

From: Efficacy of combining oral Chinese herbal medicine and NB-UVB in treating psoriasis vulgaris: a systematic review and meta-analysis

Outcomes RR (95 % CI), I2, NNT
 PASI-60 or above
 17 studies 1.35 (1.26, 1.45), I2 = 5 %, 4.27
  Studies with <8 (4–6) weeks treatment (five studies) 1.38 (1.22, 1.55), I2 = 0 %
  Studies with 8–12 weeks treatment (12 studies) 1.34 (1.23, 1.47), I2 = 16 %
  Studies with moderate to severe psoriasis (baseline PASI 14-20) (seven studies) 1.35 (1.17, 1.56), I2 = 45 %
  Studies using three common herbs (di huang, dang gui, tu fu ling) (six studies) 1.31 (1.16, 1.47), I2 = 22 %
  Studies using three common herbs (five studies, one study that used three formulae was excluded) 1.37 (1.22, 1.54), I2 = 0 %
  Studies with low risk on sequence generation (five studies) 1.39 (1.23, 1.58), I2 = 0 %
PASI-90 or above
 17 studies 1.71 (1.45, 2.01), I2 = 0 %, 5.92
NB-UVB-induced AEs
 12 studies 0.66 (0.46, 0.96), I2 = 53 %
  Studies with <8 (4–6) weeks treatment (four studies) 0.77 (0.42, 1.43), I2 = 62 %
  Studies with 8–12 weeks treatment (eight studies) 0.60 (0.38, 0.94), I2 = 46 %
  1. RR RISK ratio, NNT number need to treat