Table 1.

Characteristics of pancreatic cancer case patients and population control subjects in urban Shanghai, China, 2006–2011

CharacteristicsNo. of cases (%)aNo. of controls (%)aPb
Total number761794
Age at interview, y
 Mean (SD)64.9 (9.6)64.9 (9.9)0.99
 35–4959 (7.8)63 (7.9)
 50–59183 (24.0)193 (24.3)
 60–69231 (30.4)232 (29.2)
 70–79288 (37.8)306 (38.5)
Sex
 Male435 (57.2)460 (57.9)0.74
 Female326 (42.8)334 (42.1)
Education
 Primary school or lower146 (19.2)142 (17.9)0.21c
 Middle or high school445 (58.5)498 (62.7)
 College or higher170 (22.3)154 (19.4)
BMI at age 21 years, mean (SD)
 Males20.6 (2.30)20.2 (2.02)10–4.4d
 Females20.5 (2.50)19.9 (2.34)
History of diabetes mellitus
 Never581 (76.3)693 (87.3)
 Within previous 3 years80 (10.5)22 (2.8)10–10.1c
 More than 3 years in the past100 (13.1)79 (9.9)
H. pylori CagA seropositivity
 No319 (41.9)257 (32.4)10–4.0
 Yes442 (58.1)537 (67.6)
ABO blood groupe
 O200 (26.3)250 (31.5)
 A289 (38.0)225 (28.3)10–3.6
 B193 (25.4)229 (28.8)0.70
 AB79 (10.4)90 (11.3)0.61
Tobacco use
 Never smoker428 (56.3)458 (57.7)0.55c
 Former smoker97 (12.7)109 (13.7)
 Current smoker236 (31.0)227 (28.6)
Cigarettes, years of smoking, mean (SD)
 Among former smokers29.2 (14.5)30.2 (12.5)0.76d
 Among current smokers36.5 (10.5)36.0 (10.5)
Cigarettes, frequency per day, mean (SD)
 Among former smokers16.7 (10.2)14.9 (9.3)0.029d
 Among current smokers17.8 (9.2)16.1 (9.3)
  • Abbreviation: BMI, body mass index, weight/height2 (kg/m2)

  • aValues in the table are numbers (percentages) of participants unless indicated otherwise.

  • bP values calculated by χ2 distribution for categorical variables (sex, education, H. pylori CagA seropositivity, ABO blood group, each group vs. group O) and as trends by unconditional logistic regression for continuous variables (age at interview, BMI at age 21 years, years of smoking, and cigarette frequency per day).

  • cP value based on 2 degrees of freedom for homogeneity of risk across three categories.

  • dP value based on 2 degrees of freedom for simultaneous continuous trends in both strata.

  • eFor ABO group A vs. non-A, the P value is 10–4.2.