Table 3.
Differences in Sleep Time and Blood Biochemical Factors Across Cumulative Dietary Tryptophan Intake
| Dietary Tryptophan Intake in Tertiles | Dietary Tryptophan Intake in Continuous Form | ||||||
|---|---|---|---|---|---|---|---|
| T1 | T2 | T3 | Effect Size | P for Trend | Effect Size | P-Value | |
| Sleep time (h) | 8.10 (0.027) | 8.12 (0.025) | 8.19 (0.027) | 0.042 (0.020) | 0.033 | 0.055(0.016) | 0.001 |
| FPG (mmol/L) | 5.58 (0.040) | 5.38 (0.038) | 5.39 (0.042) | −0.091 (0.030) | 0.003 | −0.097 (0.021) | <0.001 |
| HbA1c (%) | 5.86 (0.026) | 5.56 (0.025) | 5.56 (0.027) | −0.148 (0.020) | <0.001 | −0.152(0.016) | <0.001 |
| TC (mmol/L) | 4.98 (0.027) | 4.92 (0.026) | 4.84 (0.028) | −0.072 (0.021) | <0.001 | −0.063(0.017) | <0.001 |
| LDL-C (mmol/L) | 3.11 (0.026) | 2.99 (0.025) | 2.95 (0.028) | −0.081 (0.020) | <0.001 | −0.071(0.016) | <0.001 |
| APO-B (g/L) | 0.93 (0.007) | 0.89 (0.007) | 0.88 (0.007) | −0.021 (0.005) | <0.001 | −0.018(0.004) | <0.001 |
Notes: Multivariable generalized linear models were used to probe for differences across tertiles of tryptophan consumption with adjustment for sex, age, BMI, WHR, smoking status, drinking status, living site, physical activity, urban index, cardiovascular disease, AHEI, SFA, fiber, sugar, fruit, vegetable, and energy intake. Multivariable linear regression models were used to calculate the effect sizes per 1 mg/g protein increment of tryptophan, adjusting for the same variables. Data are mean (SD).
Abbreviations: FPG, fasting plasma glucose; HbA1c, glycosylated hemoglobin; TC, total cholesterol; LDL-C, low-density lipoprotein cholesterol; APO-B, apolipoprotein B; BMI, body mass index; WHR, waist-to-hip ratio; AHEI, Alternate Healthy Eating Index; SFA, saturated fatty acid.