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Table 2 Distribution of the demographic characteristics of cases and controls

From: Novel risk factors for primary prevention of oesophageal carcinoma: a case-control study from Sri Lanka

Demographic characteristic Cases (N = 49) Controls (N = 196)
No. % No. %
Sex
 Male 34 69.4 70 35.7
 Female 15 30.6 126 64.3
Current marital status
 Married 41 83.6 136 69.4
 Single 4 8.2 39 19.8
 Divorced/separated/widowed 4 8.2 21 10.8
Ethnicity
 Sinhala 43 87.8 145 74.0
 Other ethnicities (Tamil, Muslim, Burgher) 6 12.2 51 26.0
Highest educational level
 Primary and lower 15 30.6 31 15.8
 Secondary 33 67.4 153 78.0
 Tertiary 1 2.0 12 6.2
Employment status
 Currently employed 7 14.2 72 36.7
 Previously employed 35 71.4 59 30.1
 Never employed 7 14.3 65 33.2
Social statusa
 Social class I-Leading professionals 1 2.0 8 4.1
 Social class II-Lesser professionals 2 4.1 18 9.2
 Social class III-Skilled workers & non-manual workers 15 30.6 56 28.6
 Social class IV- Partly skilled workers 13 26.5 28 14.3
 Social class V- Unskilled workersb 18 36.7 86 43.9
Monthly family income (SLR)
  < 20,000 24 49 88 44.9
 20,001-50,000 20 40.8 90 45.9
 50,001-100,000 5 10.2 15 7.7
  > 100,000 0 0.0 3 1.5
  1. aClassification based on the occupation
  2. bBased on the classification, the unemployed are included in the social class V as well