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Table 2 Distribution of 155 case and 310 control characteristics across categories of Dietary Inflammatory Index (DII)

From: “Association between dietary inflammatory index (DII) and risk of irritable bowel syndrome: a case-control study”

Variables Mean ± SD or N (%) P value
Quartile1
(<−1.49)
Quartile2
(−1.49 ≤ to < 0.11)
Quartile3
(0.11 ≤ to < 1.65)
Quartile4
(1.65≤)
Age (year) a Case 38.85 ± 13.72 37.57 ± 11.66 39.92 ± 13.81 39.72 ± 10.57 0.857
Control 39.92 ± 12.67 39.75 ± 12.04 38.11 ± 12.26 38.87 ± 11.61 0.771
Body mass index (BMI, kg/m2) a Case 24.51 ± 2.62 24.52 ± 3.39 25.66 ± 3.83 25.69 ± 4.19 0.330
Control 24.38 ± 3.68 25.09 ± 3.57 25.52 ± 3.45 25.58 ± 2.90 0.107
Waist circumference (WC,cm) a Case 89.85 ± 12.01 92.75 ± 11.90 94.47 ± 11.68 96.60 ± 12.47 0.106
Control 90.05 ± 12.22 92.80 ± 11.83 92.89 ± 11.20 94.55 ± 9.64 0.109
Total energy (Kcal) a Case 1896.10 ± 360.78 2098.27 ± 298.56 2275.73 ± 349.66 2420.80 ± 322.16 0.000
Control 2221.55 ± 424.37 2261.26 ± 401 ± 19 2400.40 ± 415.39 2464.10 ± 487.91 0.002
Physical activity (MET) a Case 782.48 ± 1232.04 710.92 ± 887.50 842.56 ± 1482.24 1676.19 ± 2099.93 0.015
Control 1060.17 ± 1729.62 1194.27 ± 1335.09 1236.95 ± 1314.58 2028.97 ± 3288.18 0.022
Marital status b Single Control 23 (30.7%) 19 (25.3%) 17 (22.7%) 16 (21.3%) 0.849
Married Control 67 (28.5%) 67 (28.5%) 59 (25.1%) 42 (17.95)
Single Case 11 (25.6%) 14 (32.6%) 8 (18.6%) 10 (23.3%) 0.003
Married Case 16 (14.3%) 14 (12.5%) 34 (30.4%) 48 (42.9%)
Occupation b Freelance Control 48 (28.7%) 45 (26.9%) 38 (22.8%) 36 (21.6%) 0.787
Employee Control 20 (32.8%) 17 (27.9%) 13 (21.3%) 11 (18.0%)
Unemployed Control 5 (38.5%) 4 (30.8%) 3 (23.1%) 1 (7.7%)
Housewife Control 17 (24.6%) 20 (29.0%) 22 (31.9%) 10 (14.5%)
Freelance Case 10 (16.9%) 9 (15.3%) 12 (20.3%) 28 (47.5%) 0.388
Employee Case 7 (14.6%) 9 (18.8%) 13 (27.1%) 19 (39.6%)
Unemployed Case 1 (20.0%) 2 (40.0%) 2 (40.0%) 0 (0.0%)
Housewife Case 9 (20.9%) 8 (18.6%) 15 (34.9%) 11 (25.6%)
Smoking b Yes Control 3 (15.8%) 5 (26.3%) 4 (21.1%) 7 (36.8%) 0.180
No Control 87 (29.9%) 81 (27.8%) 72 (24.7%) 51 (17.5%)
Yes Case 1 (6.7%) 3 (20.0%) 5 (33.3%) 6 (40.0%) 0.704
No Case 26 (18.6%) 25 (17.9%) 37 (26.4%) 52 (37.1%)
Passive smoking b Yes Control 73 (27.4%) 78 (29.3%) 67 (25.2%) 48 (18.0%) 0.250
No Control 17 (38.6%) 8 (18.2%) 9 (20.5%) 10 (22.7%)
Yes Case 22 (18.3%) 20 (16.7%) 30 (25/0%) 48 (40.0%) 0.451
No Case 5 (14.3%) 8 (22.9%) 12 (34.3%) 10 (28.6%)
  1. aThe One-way analysis of variance (ANOVA) was used for comparison of the variables between DII quartiles
  2. bData are numbers (%), and were analyzed by chi-squared test or Fisher’s exact test