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Table 3 Visual analogue scale pain scores, with mean and standard deviation (SD), maximum and minimum values for each group

From: Metamizole versus placebo for panretinal photocoagulation pain control: a prospective double-masked randomized controlled study

Treatment groups Metamizole Placebo ρ value
Mean ± SD (Minimum–maximum) Mean ± SD (Minimum–maximum)
VAS (visual analogue scale) 4.72 ± 1.71 (1–8) 5.89 ± 1.97 (1–10) 0.002
  1. The mean pain score value was higher in the placebo group, in comparison with the metamizole group. Statistical significance is showed on the table. Note that only in the placebo group the maximum pain score was achieved