Table 3.
Poisson regression models for cognitive impairment and monthly communication event count.
| Variable | Model 1 | Model 2 | Model 3 | |||
|---|---|---|---|---|---|---|
| Communication events per month (SD) | 0.58 | [0.48, 0.69] | 0.64 | [0.55, 0.75] | 0.71 | [0.60, 0.83] |
| Age and gender (ref: men 40–49) | ||||||
| Men 50-59 | 1.08 | [0.45, 2.63] | 0.93 | [0.46, 1.88] | 1.14 | [0.56, 2.32] |
| 60-69 | 1.43 | [0.73, 2.81] | 0.86 | [0.49, 1.52] | 1.16 | [0.73, 1.83] |
| 70-79 | 2.50 | [1.29, 4.85] | 1.34 | [0.76, 2.35] | 1.85 | [1.13, 3.05] |
| 80+ | 4.81 | [2.52, 9.15] | 2.03 | [1.18, 3.48] | 2.68 | [1.65, 4.35] |
| Women 40-49 | 0.22 | [0.06, 0.80] | 0.28 | [0.08, 0.99] | ||
| 50-59 | 0.99 | [0.40, 2.46] | 0.61 | [0.28, 1.36] | 0.81 | [0.39, 1.70] |
| 60-69 | 1.66 | [0.76, 3.63] | 0.79 | [0.41, 1.54] | 0.97 | [0.54, 1.76] |
| 70-79 | 3.58 | [1.80, 7.14] | 1.39 | [0.75, 2.57] | 1.64 | [0.94, 2.86] |
| 80+ | 7.24 | [3.94, 13.3] | 2.39 | [1.41, 4.06] | 2.83 | [1.79, 4.47] |
| Educational attainment (ref: no formal education) | ||||||
| Some primary (1–7 years) | 0.80 | [0.61, 1.05] | 0.83 | [0.63, 1.10] | ||
| Some secondary or more (8+ years) | 0.65 | [0.33, 1.26] | 0.78 | [0.41, 1.50] | ||
| Can vs. cannot read or write | 0.15 | [0.11, 0.22] | 0.17 | [0.12, 0.23] | ||
| Country of origin: Mozambique/other vs South Africa |
1.17 | [0.97, 1.42] | 1.20 | [1.00, 1.46] | ||
| Father's occupation (ref: skilled) | ||||||
| Unskilled | 1.24 | [0.98, 1.56] | 1.20 | [0.97, 1.49] | ||
| Other | 1.33 | [0.96, 1.84] | 1.27 | [0.93, 1.73] | ||
| Don't know | 1.57 | [1.30, 1.90] | 1.59 | [1.32, 1.91] | ||
| Childhood self-rated health: | ||||||
| Good/very good vs. moderate/bad/very bad | 0.73 | [0.57, 0.94] | 0.78 | [0.61, 1.01] | ||
| Marital status (ref: currently married) | ||||||
| Never married | 2.46 | [1.76, 3.46] | ||||
| Separated/divorced | 1.48 | [1.03, 2.13] | ||||
| Widowed | 1.44 | [1.08, 1.91] | ||||
| Employment status (ref: not working) | ||||||
| Employed (part or full time) | 0.61 | [0.36, 1.03] | ||||
| Homemaker | 0.72 | [0.46, 1.11] | ||||
| Household size (ref: living alone) | ||||||
| Living with one other person | 1.25 | [0.88, 1.78] | ||||
| Living with 2–5 others | 1.07 | [0.76, 1.51] | ||||
| Living with 6+ others | 0.93 | [0.72, 1.20] | ||||
| Household asset level (ref: lowest quintile) | ||||||
| Second lowest quintile | 1.00 | [0.79, 1.27] | ||||
| Middle quintile | 0.89 | [0.72, 1.09] | ||||
| Second highest quintile | 0.97 | [0.73, 1.29] | ||||
| Highest quintile | 0.77 | [0.55, 1.07] | ||||
| Intraclass correlation coefficient | 0.203 | 0.156 | 0.167 | |||
Note. Values presented are prevalence rate ratios and [95% confidence intervals]. N = 4973 for all models. All models are hierarchical (individuals nested in interviewers) Poisson regressions with robust error variance and contain fixed effects for month of interview. SD: Standard deviations.