Primary Outcomes: Adjusted* and Unadjusted† Group Differences at 6 Months and 9 to 12 Months After Baseline
| Baseline (mean [n]) | 6 Months (mean [n]) | 9 to 12 Months (mean [n]) | Change from Baseline to 6 Months | Change from Baseline to 9 to 12 Months | |
|---|---|---|---|---|---|
| Systolic BP (mmHg) | |||||
| Intervention group AB | 141.3 (108) | 135.5 (92) | 134.0 (81) | −5.8 | −7.3 |
| Control group C | 139.0 (91) | 133.6 (74) | 133.8 (60) | −6.4 | −5.2 |
| Unadjusted P for AB vs C | .5433 | .3836 | .9427 | ||
| Adjusted P for AB vs C | na | .4969 | .6475 | ||
| HbA1C (%) | |||||
| Intervention group AB | 7.5 (106) | 8.3 (87) | 7.4 (74) | 0.8 | −0.1 |
| Control group C | 7.6 (85) | 7.8 (63) | 7.4 (63) | 0.2 | −0.2 |
| Unadjusted P for AB vs C | .4102 | .0567 | .6440 | ||
| Adjusted P for AB vs C | na | .0429 | .9164 | ||
| SF-36 Physical composite score‡ | |||||
| Intervention group AB | 38.0 (107) | 42.7 (84) | 41.4 (74) | 4.7 | 3.4 |
| Control group C | 40.9 (88) | 42.6 (74) | 41.6 (72) | 1.7 | 0.7 |
| Unadjusted P for AB vs C | .0829 | .4145 | .4345 | ||
| Adjusted P for AB vs C | na | .9598 | .9056 | ||
| SF-36 mental composite score | |||||
| Intervention group AB | 46.8 (107) | 42.7 (84) | 45.7 (74) | −4.1 | −1.1 |
| Control group C | 46.8 (88) | 40.1 (74) | 47.9 (72) | −6.7 | 1.1 |
| Unadjusted P for AB vs C | .9779 | .2666 | .5200 | ||
| Adjusted P for AB vs C | na | .2187 | .2916 | ||
| Rate of primary doctor§ | |||||
| Intervention group AB | 9.3 (98) | 9.5 (71) | 0.2 | ||
| Control group C | 9.2 (86) | 9.3 (67) | 0.1 | ||
| Unadjusted P for AB vs C | .6931 | .0255 | |||
| Adjusted P for AB vs C | na | .6372 | |||
| Rating of overall health care§ | |||||
| Intervention group AB | 9.3 (98) | 8.3 (71) | −1.0 | ||
| Control group C | 9.2 (86) | 8.5 (67) | −0.7 | ||
| Unadjusted P for AB vs C | .6931 | .0255 | |||
| Adjusted P for AB vs C | na | .6709 | |||
| LDL cholesterol‖ | |||||
| Intervention group AB | 137.0 (24) | 139.4 (18) | 135.4 (18) | 2.4 | −1.6 |
| Control group C | 137.3 (16) | 130.5 (11) | 110.6 (11) | −6.6 | −26.7 |
| Unadjusted P for AB vs C | .9471 | .6716 | .3238 | ||
| Adjusted P for AB vs C |
* Unadjusted: P adjusted only for clustering of patient within clinic and baseline outcome variable values for 6 months and 12 month comparisons.
† Adjusted: P adjusted for clustering, baseline outcome values, age, sex, race, education, employment status, health insurance, whether already had an SP, relationship with SP, baseline values for medication adherence, perceived health competence, patient self-report of history of high BP, history of high cholesterol, smoking status, alcohol use and history of cardiovascular events score (1 point each for previous myocardial infarction, stroke, transient ischemic attack, coronary revascularization, and congestive heart failure). Given the limited sample size for LDL measurements, no adjusted P are presented.
‡ SF-36 subscale possible range is 0–100.
§ Doctor and healthcare satisfaction scales each have possible range from 0–10.
‖ The smaller subsample of patients with measured LDL permitted analyses controlling only for baseline LDL and clustering within clinic, not for adjusted analyses with additional covariates.
BP, blood pressure; LDL, low-density lipoprotein, SP, support person.