Table 1 Characteristics of study participants
ControlsAdenocarcinoma of the oesophagusAdenocarcinoma of the gastro-oesophageal junction
MenWomenMenWomenMenWomen
(n = 1040)(n = 540)(n = 330)(n = 37)(n = 370)(n = 56)
AgeMean (SD)62.5 (10.5)56.7 (12.8)63.5 (9.3)65.6 (11.9)63.6 (9.6)61.8 (10.5)
Educational level (%)School35.950.643.664.937.358.9
Trade29.110.029.118.928.414.3
Diploma18.425.920.013.522.719.6
Degree16.413.36.72.711.17.1
Not stated0.30.20.600.50
BMI last yearMean (SD)26.9 (4.2)26.9 (5.7)29.1 (5.0)29.6 (8.3)28.3 (4.7)28.8 (6.1)
Maximum BMIMean (SD)28.5 (4.6)28.7 (6.1)30.8 (5.0)32.1 (8.5)29.8 (4.7)31.3 (7.1)
BMI age 20 yearsMean (SD)23.0 (3.3)21.6 (3.4)23.9 (3.6)22.5 (3.5)23.6 (3.1)23.0 (3.7)
Smoking statusNever smoker37.259.823.940.520.835.7
Quit >20 years28.113.725.216.228.414.3
Quit 1–20 years19.812.631.216.223.517.9
Current13.113.319.127.026.532.1
Cumulative smoking history (pack-years)Never smoker37.259.823.940.520.835.7
1–1425.224.620.018.920.021.4
15–2915.09.419.116.222.717.9
30–4913.23.722.416.222.423.2
50+9.42.414.68.114.01.8
Frequency of reflux symptoms 10 years agoNever42.148.221.529.727.035.7
<Weekly45.140.236.421.635.732.1
⩾Weekly11.911.341.543.236.830.4
Mean alcohol consumption (10 g alcohol units/week)Never drinker9.525.77.324.36.825.0
<1 Drink/week1.55.72.400.85.4
1–6 Drinks/week24.644.419.456.825.744.6
7–20 Drinks/week36.821.537.318.936.223.2
21+ Drinks/week27.52.633.3030.51.8
Frequency of aspirin useNever39.253.045.262.145.144.6
Occasional40.534.633.627.034.333.9
<Weekly4.52.86.12.73.87.1
⩾Weekly15.69.314.28.115.714.3
  • Column percentages may not sum to 100% owing to rounding and missing values.