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Table 1 Clinical demographics of chronic pancreatitis patients (n = 346) and controls (n = 346) in a retrospective case-control study

From: Cigarette smoking associated with chronic pancreatitis: a case control study in China

Variable Chronic Pancreatitis Control   P value
number percent number percent  
All subjects 346   346   
Age (mean ± SD, years) 48.97 ± 14.11 49.16 ± 14.40  
< 30 (years) 28 8.10% 29 8.40% 0.89
≥ 30 (years) 318 91.90% 317 91.00%
Gender
 Male 267 77.17% 270 78.03% 0.784
 Female 79 22.83% 76 21.97%
Body mass index (kg/m2) 22.46 ± 13.52 24. 59 ± 3.29  
10–18.5 26 8% 46 13.29% 0.018
≥ 18.5 110 32% 83 23.99%
Smoking duration (years)
  < 20 236 68.21% 245 70.81% 0.001
 20–30 58 16.76% 78 22.54%
  > 30 52 15.03% 23 6.65%
Smoking index (pack x year)
  < 400 260 75% 291 84.10% 0.001
 400–800 72 21% 42 12.14%
  ≥ 800 14 4% 13 3.76%
Drinking status
 no 204 58.96% 161 46.53% 0.001
 yes 142 41.04% 185 53.47%
Drinking duration (Drinking years)
  < 20 1 0.29% 50 14.45% 0.001
 20–35 2 0.58% 23 6.65%
  ≥ 35 129 37.28% 94 27.17%
Alcohol intake (g/month)
 1–18 37 10.69% 6 1.73% 0.001
 18–90 53 15.32% 13 3.76%
 91–180 42 12.14% 148 42.77%
Alcohol consumption (Alcohol intakex Drinking duration)
 0 240 69.36% 185 53.47% 0.001
 1 80 23.12% 158 45.66%
 3 26 7.51% 3 0.87%
Biliary disease
 No 210 60.70% 344 99.4%  
 Yes 136 39.30% 2 0.6%  
  1. Alcohol intake (grams per month) was expressed as grams of alcohol consumption per month
  2. Drinking duration was calculated as years of drinking (drinking years)
  3. Alcohol consumption = Alcohol intake (grams per month) x Drinking duration (drinking years)
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