Table 3

Regression analysis of dietary and lifestyle factors and fecal calprotectin levels

RC = regression coefficient = relative change in faecal calprotectin per unit increase in explanatory variable. Age expressed as age (years)/10. Coefficient for age is per decade. Coefficient for body mass index (BMI) is per 10 kg/m2. Smoking is expressed as pack years. Alcohol is expressed as units per week (1 unit = 8 grams of alcohol). Fruit and vegetables are as portions/pieces/servings per day. % food groups are the percentage food group of interest divided by the total number of portions/pieces/servings of all food groups in the previous week. C-reactive protein (CRP) is expressed as mg/l.

UnadjustedAdjusted for age and sexAdjusted for age, sex, stool form and NSAIDsaAdjusted for age, sex, stool form, NSAIDs and serum CRP
RC95% CIPRC95% CIPRC95% CIPRC95% CIP
Age1.351.12–1.630.0021.351.12–1.630.0021.311.09–1.590.0051.301.07–1.60.01
Sex0.940.75–1.180.600.910.73–1.140.420.920.73–1.150.460.920.73–1.160.14
BMI1.401.02–1.910.041.391.09–1.620.041.421.06–1.570.031.300.94–1.60.54
Exercise0.690.52–0.420.010.680.52–0.900.010.710.54–0.950.020.720.54–0.960.02
Smoking1.070.99–1.010.111.0050.99–1.120.151.0050.99–1.010.221.0020.99–1.010.50
Alcohol0.990.98–1.050.170.990.98–1.070.390.990.98–1.010.420.990.98–1.010.71
Fruit0.950.87–1.040.300.950.87–1.050.330.950.87–1.040.290.950.86–1.040.59
Vegetables0.900.8–1.010.060.890.8–1.0050.060.890.79–0.990.040.890.79–1.010.07
% Carbohydrate0.990.97–1.010.420.990.97–1.010.380.990.97–1.010.440.990.97–1.010.84
% Fat1.011.00–1.030.181.011.00–1.030.111.010.99–1.030.111.010.99–1.030.66
% Fibre0.980.96–1.000.050.980.96–1.000.020.980.96–0.990.030.980.96–0.990.04
% Protein1.010.99–1.030.301.010.99–1.030.241.010.99–1.040.351.010.98–1.380.34
CRP (mg/l)1.281.002–1.630.051.140.89–1.460.301.130.87–1.460.361.13b0.87–1.460.36
  • a NSAID, nonsteroidal anti-inflammatory drug; CI, confidence interval.

  • b Not adjusted for C-reactive protein.