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Table 3 Adjusted geometric means of HbA1c according to combined categories of bilirubin and coffee consumption*

From: No effect modification of serum bilirubin or coffee consumption on the association of gamma-glutamyltransferase with glycated hemoglobin in a cross-sectional study of Japanese men and women

  

Low bilirubin†

High bilirubin†

Sex

Coffee (cups/day)

n

Geometric mean

n

Geometric mean

Men

< 1

877

5.16 (5.12–5.21)

1034

5.08 (5.05–5.12)

 

1–3

1077

5.13 (5.09–5.16)

959

5.04 (5.01–5.08)

 

≥ 4

359

5.16 (5.10–5.23)

186

5.18 (5.10–5.27)

 

Trend‡

 

P = 0.74

 

P = 0.55

Women

< 1

1125

5.14 (5.12–5.17)

1498

5.06 (5.04–5.08)

 

1–3

1503

5.11 (5.09–5.13)

1578

5.06 (5.04–5.08)

 

≥ 4

282

5.09 (5.04–5.14)

256

5.02 (4.97–5.07)

 

Trend‡

 

P = 0.04

 

P = 0.37

  1. In parentheses are 95% confidence intervals of geometric means. Interaction P values were 0.43 in men and 0.37 in women.
  2. * Adjusted for age, smoking, alcohol intake and body mass index by analysis of covariance.
  3. † Low: < 0.6 mg/dL in men and < 0.5 mg/dL in women; high: ≥ 0.6 mg/dL in men and ≥ 0.5 mg/dL in women.
  4. ‡ Ordinal values were assigned to coffee categories.
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BMC Endocrine Disorders

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