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Table 1 Comparison between responders and non-responders

From: The burden of headache disorders in India: methodology and questionnaire validation for a community-based survey in Karnataka State

  Responders Non-respondersa
Urban Rural Total Urban Rural Total
n 1,226 1,103 2,329 128 57 185
Male gender (%) 49.8 48.1 49.0 75 77.2 75.7
Age (mean ± SD) 36.7 ± 12.4 39.5 ± 13.0 38.0 ± 12.8 35.4 ± 11.1 39.0 ± 12.1 37.0 ± 11.8
Socio-economic status (%)
 Upper (I) 2.0 0.0 1.1 3.0 0.0 2.2
 Upper middle (II) 27.7 4.2 16.6 30.2 6.5 23.2
 Lower middle (III) 44.0 15.7 30.6 42.2 17.6 34.6
 Upper lower (IV) 25.4 77.2 49.9 23.1 72.1 38.4
 Lower (V) 0.8 2.9 1.8 1.5 3.8 2.2
  1. aIncludes both refusals (n = 25, all urban) and non-participants (interview not possible even after three appointments, at least two of them on Sundays or holidays)