Table 4.
Modification effect of tea intake on association of sleep duration and diabetes incidence by age and risk score.*
| Sleep duration | <7 hours | 7–7.9 hours | ≥8 hours | plinear | pinteraction | |||
|---|---|---|---|---|---|---|---|---|
| n=7351 | n=6213 | n=9185 | ||||||
|
|
|
|
||||||
| cases | HR CI (95%) | cases | HR | cases | HR CI (95%) | |||
| Age <60 (years) | ||||||||
|
| ||||||||
| Currently drink tea | ||||||||
|
| ||||||||
| Yes | 241 | 0.97 (0.80,1.17) | 190 | 1.00 | 297 | 1.08 (0.89, 1.30) | 0.22 | 0.37 |
|
| ||||||||
| No | 91 | 1.01 (0.74,1.39) | 71 | 1.00 | 147 | 1.26 (0.94, 1.69) | 0.10 | |
|
| ||||||||
| Age ≥ 60 (years) | ||||||||
|
| ||||||||
| Currently drink tea | ||||||||
|
| ||||||||
| Yes | 98 | 1.34 (0.97,1.85) | 60 | 1.00 | 109 | 1.18 (0.86, 1.63) | 0.41 | <0.01 |
|
| ||||||||
| No | 76 | 0.78 (0.55,1.10) | 61 | 1.00 | 80 | 1.24 (0.88, 1.74) | <0.01 | |
|
| ||||||||
| Low risk (score: 0–2) | ||||||||
|
| ||||||||
| Currently drink tea | ||||||||
|
| ||||||||
| Yes | 82 | 1.08 (0.75, 1.56) | 50 | 1.00 | 78 | 1.20 (0.84, 1.73) | 0.54 | 0.43 |
|
| ||||||||
| No | 50 | 1.06 (0.65, 1.72) | 27 | 1.00 | 54 | 1.49 (0.92, 2.41) | 0.10 | |
|
| ||||||||
| Moderate risk (score: 3–4) | ||||||||
|
| ||||||||
| Currently drink tea | ||||||||
|
| ||||||||
| Yes | 132 | 1.07 (0.82, 1.39) | 102 | 1.00 | 182 | 1.14 (0.89, 1.46) | 0.54 | 0.34 |
|
| ||||||||
| No | 67 | 0.95 (0.66, 1.37) | 62 | 1.00 | 95 | 1.22 (0.87, 1.72) | 0.12 | |
|
| ||||||||
| High (score: >4) risk | ||||||||
|
| ||||||||
| Currently drink tea | ||||||||
|
| ||||||||
| Yes | 125 | 1.00 (0.77, 1.31) | 98 | 1.00 | 146 | 1.08 (0.84,1.41) | 0.51 | 0.03 |
|
| ||||||||
| No | 50 | 0.68 (0.45, 1.04) | 43 | 1.00 | 78 | 1.17 (0.80, 1.72) | <0.01 | |
*
Adjusted for age, BMI, energy intake, smoking (pack-years), drinking (drinks per day), current tea drinking, exercise (met-hours/year), hypertension, family history of diabetes, shiftwork, snoring, and comorbidity (stratifying variable was not adjusted in the model). Excludes those cases that were diagnosed within 2 years of recruitment.