Table 1 Demographic characteristics of ESCC cases and matched controls

From: Opium, tobacco, and alcohol use in relation to oesophageal squamous cell carcinoma in a high-risk area of Iran

 

ESCC cases

Matched controls

 

N (%)

N (%)

Total

300 (100)

571 (100)

Age (years)

 ⩽50

32 (11)

61 (11)

 51–60

81 (27)

144 (25)

 61–70

86 (29)

177 (31)

 >70

101 (34)

189 (33)

Gender

 Male

150 (50)

278 (49)

 Female

150 (50)

293 (51)

Place of residence

 Urban

82 (27)

150 (26)

 Rural

218 (73)

421 (74)

Ethnicity

 Turkmen

171 (57)

312 (55)

 Non-Turkmen

129 (43)

259 (45)

  1. ESCC=oesophageal squamous cell carcinoma.
  2. Although cases and controls were individually matched, the percentages of cases and controls are not necessarily equal in each age, gender, or place of residence category, because some cases have one matched control and others have two matched controls.
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