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Table 1 Age and gender distributions of the dermatomyositis and polymyositis study groups

From: Cancer risks of dermatomyositis and polymyositis: a nationwide cohort study in Taiwan

Age Dermatomyositis group (n = 1,012) Polymyositis group (n = 643)
  Number of cases Male Female Number of cases Male Female
<20 years 162 50 112 31 14 17
20 to 39 years 265 76 189 161 45 116
40 to 59 years 414 120 294 274 76 198
60 to 79 years 164 66 98 169 61 108
≥ 80 years 7 3 4 8 3 5
All 1,012 315 697 643 199 444