Letter to the Editor
Copyright ©The Author(s) 2022.
World J Clin Cases. Jul 26, 2022; 10(21): 7617-7619
Published online Jul 26, 2022. doi: 10.12998/wjcc.v10.i21.7617
Table 1 Baseline characteristics of study variables by tertiles of cumulative tryptophan intake in CHNS, 1997-2011[2]
Baseline variable
T1 (n = 2633)
T2 (n = 2642)
T3 (n = 2633)
P value
Age (yr)43.884 (14.624)43.196 (14.787)43.338 (15.187)0.207
Female, n (%)1296 (49.221)1338 (50.643)1330 (50.513)0.521
BMI (kg/m2)22.818 (2.966)22.344 (2.957)21.668 (2.669)< 0.001
WHR0.852 (0.066)0.847 (0.061)0.845 (0.061)< 0.001
PAL (MET-h/wk)306.102 (185.951)305.386 (183.797)314.724 (178.567)0.119
Energy intake (kcal/d)2406.574 (730.597)2279.742 (631.699)2312.202 (619.281)< 0.001
Protein intake (g/d)75.854 (24.496)68.007 (21.007)63.132 (19.504)< 0.001
Fat intake (g/d)65.010 (37.716)71.561 (36.944)60.339 (32.443)< 0.001
Carbohydrate intake (g/d)376.755 (142.836)337.802 (113.510)375.947 (115.997)< 0.001
SBP (mmHg)120.945 (17.845)118.362 (17.904)116.824 (17.303)< 0.001
DBP (mmHg)78.296 (10.763)77.051 (11.277)75.871 (10.419)< 0.001
Baseline tryptophan consumption (mg/g protein)12.660 (0.972)13.812 (1.018)14.947 (1.216)< 0.001
Living in city, n (%)761 (28.902)942 (35.655)581 (22.066)< 0.001
Urban index51.952 (2.951)52.032 (2.732)51.797 (2.657)0.008
Individual income (yuan)6019.137 (6773.845)6390.557 (5712.462)5325.567 (5445.487)< 0.001
High school education, n (%)457 (17.357)570 (21.575)347 (13.179)< 0.001
Smoking, n (%)886 (33.650)889 (33.649)853 (32.397)0.537
Drinking, n (%)1008 (38.283)995 (37.661)903 (34.295)0.005
Sleep time (h)8.085 (1.135)8.098 (1.179)8.215 (1.161)< 0.001
Prevalent diabetes, n (%)32 (1.215)38 (1.438)49 (1.861)0.148
Prevalent obesity, n (%)162 (6.153)114 (4.315)69 (2.621)< 0.001
Prevalent overweight, n (%)540 (20.509)472 (17.865)274 (10.406)< 0.001
Prevalent hypertension, n (%)554 (21.041)478 (18.092)391 (14.850)< 0.001