. 2021 Mar 26;320(5):H2058–H2065. doi: 10.1152/ajpheart.00023.2021

Table 4.

Hierarchical regression models predicting time 2 cardiac index for full sample and stratified by ethnicity

	b	t	P	r	r_partial	b	t	P	r	r_partial	b	t	P	r	r_partial
A: Full sample	Model 1 (R² = 0.105)					Model 2 (R²_change = 0.027)					Model 3 (R²_change = 0.000)
Age _T1	−0.005	−0.11	0.916	−0.102	−0.005	−0.020	−0.39	0.700	−0.102	−0.020	−0.023	−0.44	0.657	−0.102	−0.023
Sex	−0.063	−1.24	0.214	−0.121	−0.064	−0.073	−1.46	0.145	−0.121	−0.075	−0.073	−1.46	0.146	−0.121	−0.075
Ethnicity	−0.152	−2.97	0.003	−0.211	−0.151	−0.139	−2.74	0.006	−0.211	−0.140	−0.138	−2.72	0.007	−0.211	−0.139
BMI _T1	−0.225	−4.29	0.000	−0.272	−0.215	−0.220	−4.26	0.000	−0.272	−0.214	−0.221	−4.27	0.000	−0.272	−0.215
Father’s education _T1	0.030	0.59	0.555	0.120	0.030	0.029	0.57	0.569	0.120	0.029	0.029	0.57	0.569	0.120	0.029
Smoking _T1	−0.007	−0.14	0.885	0.003	−0.007	−0.018	−0.37	0.711	0.003	−0.019	−0.019	−0.38	0.702	0.003	−0.020
CI _T1						0.165	3.42	0.001	0.172	0.173	0.160	3.19	0.002	0.172	0.162
HF-HRV _T1											−0.023	−0.45	0.655	−0.051	−0.023
B: EAs	Model 1 (R² = 0.067)					Model 2 (R²_change = 0.040)					Model 3 (R²_change = 0.000)
Age _T1	0.018	0.23	0.821	−0.075	0.017	0.003	0.03	0.973	−0.075	0.003	0.004	0.06	0.956	−0.075	0.004
Sex	−0.052	−0.69	0.492	−0.090	−0.052	−0.045	−0.61	0.545	−0.090	−0.046	−0.045	−0.60	0.551	−0.090	−0.046
BMI _T1	−0.252	−3.08	0.002	−0.253	−0.229	−0.253	−3.15	0.002	−0.253	−0.235	−0.252	−3.12	0.002	−0.253	−0.233
Father’s education _T1	−0.008	−0.10	0.918	0.063	−0.008	−0.012	−0.16	0.871	0.063	−0.012	−0.011	−0.15	0.881	0.063	−0.011
Smoking _T1	−0.009	−0.12	0.905	−0.028	−0.009	−0.029	−0.39	0.696	−0.028	−0.030	−0.028	−0.38	0.705	−0.028	−0.029
CI _T1						0.201	2.75	0.007	0.192	0.206	0.204	2.73	0.007	0.192	0.205
HF-HRV _T1											0.017	0.22	0.826	0.003	0.017
C: AAs	Model 1 (R² = 0.065)					Model 2 (R²_change = 0.023)					Model 3 (R²_change = 0.004)
Age _T1	−0.020	−0.28	0.779	−0.067	−0.020	−0.036	−0.51	0.609	−0.067	−0.036	−0.047	−0.66	0.510	−0.067	−0.047
Sex	−0.076	−1.07	0.284	−0.095	−0.076	−0.098	−1.38	0.171	−0.095	−0.097	−0.096	−1.34	0.180	−0.095	−0.095
BMI _T1	−0.217	−3.06	0.003	−0.238	−0.211	−0.209	−2.97	0.003	−0.238	−0.206	−0.209	−2.97	0.003	−0.238	−0.206
Father’s education _T1	0.058	0.84	0.403	0.085	0.059	0.060	0.87	0.385	0.085	0.061	0.063	0.92	0.361	0.085	0.065
Smoking _T1	−0.003	−0.04	0.965	0.002	−0.003	−0.010	−0.14	0.887	0.002	−0.010	−0.010	−0.14	0.888	0.002	−0.010
CI _T1						0.154	2.26	0.025	0.141	0.158	0.136	1.90	0.059	0.141	0.133
HF-HRV _T1											−0.065	−0.90	0.371	−0.084	−0.063

This table depicts hierarchical regression models predicting cardiac index (CI) at time 2 (T2) in all individuals. Table 4A give regression statistics for the full sample, and Table 4, B C present regression statistics in European Americans (EAs) and African Americans (AAs). Age is measured in years. BMI, body mass index, kg/m²; HF-HRV, natural log transformed high frequency heart rate variability; T1, time 1. Significant predictors (P < 0.05) are bold at each step.