Table 1.
Descriptive statistics for participants in each stage of the study
| SMS1947 | 6-day sample | Followed up | Tel. interviewed | |||||
|---|---|---|---|---|---|---|---|---|
| Mean | SD | Mean | SD | Mean | SD | Mean | SD | |
| N | 70,805 | 1208 | 171 | 129 | ||||
| Sex (M/F) | 35,809/34,996 | 590/618 | 82/89 | 59/70 | ||||
| Age | 10.9 | 0.29 | 10.9 | 0.28 | 76.7 | 0.40 | 77.1 | 0.34 |
| Early life | ||||||||
| MHT score | 36.9 | 15.8 | 37.4 | 15.8 | 48.1 | 11.6 | 49.2 | 11.4 |
| SB IQ | 102.6 | 20.1 | 115.7 | 19.7 | 118.7 | 19.1 | ||
| Dependability | 9.4 | 2.2 | 10.3 | 2.2 | 10.5 | 2.2 | ||
| Childhood illnesses | 0.39 | 0.68 | 0.47 | 0.75 | 0.45 | 0.76 | ||
| Social class | 3.37 | 0.97 | 3.11 | 1.02 | 3.06 | 1.00 | ||
| Family size | 3.76 | 2.28 | 3.16 | 1.77 | 3.02 | 1.64 | ||
| Birth order | 2.41 | 1.76 | 2.08 | 1.43 | 2.08 | 1.40 | ||
| Home occupancy | 1.70 | 0.76 | 1.42 | 0.67 | 1.39 | 0.62 | ||
| Home and school moves | 3.84 | 2.12 | 3.82 | 2.04 | 3.78 | 2.02 | ||
| Childhood stressors | 0.18 | 0.42 | 0.19 | 0.43 | ||||
| EA stressors | 0.49 | 0.65 | 0.50 | 0.67 | ||||
| Later life | ||||||||
| Resilience | 21.7 | 4.2 | 22.1 | 4.4 | ||||
| Health conditions | 3.13 | 1.83 | 3.15 | 1.79 | ||||
| Medications | 4.14 | 3.06 | 3.87 | 3.02 | ||||
| HADS | 7.31 | 4.27 | 6.90 | 4.37 | ||||
| WEMWBS | 54.7 | 7.0 | 55.2 | 6.4 | ||||
| Loneliness | 0.76 | 0.91 | 0.61 | 0.91 | ||||
| NART | 35.1 | 8.0 | ||||||
| RSPM | 33.7 | 7.4 | ||||||
SMS1947 Scottish mental survey of 1947, MHT Moray House test; SB IQ Stanford Binet intelligence quotient, EA early-adulthood, HADS hospital anxiety and depression scale, WEMWBS Warwick-Edinburgh mental well-being scale, NART national adult reading test, RSPM Raven’s standard progressive matrices. Participants who reported a diagnosis of dementia were excluded from the two later subsamples