Descriptive statistics, by treatment and control groups
| Variables | Full sample | Control group | Treatment group | Difference (p value) |
|---|---|---|---|---|
| CES-D score | 8.132 (7.178) | 7.996 (7.153) | 8.771 (7.263) | 0.016 |
| Aircraft noise | 45.714 (3.106) | 44.955 (3.073) | 46.699 (2.864) | <0.001 |
| Age | 73.141 (8.548) | 73.133 (8.512) | 73.178 (8.721) | 0.908 |
| Married or living with partner | 62.5% (0.484) | 65.1% (0.477) | 50.5% (0.500) | <0.001 |
| Currently in paid employment or is self-employed | 13.2% (0.339) | 13.0% (0.337) | 14.1% (0.349) | 0.479 |
| Currently retired | 17.5% (0.380) | 17.4% (0.379) | 17.9% (0.384) | 0.748 |
| Net annual household income above the country-specific net mean household income | 40.6% (0.491) | 41.4% (0.493) | 36.9% (0.483) | 0.037 |
| Having difficulty walking 2–3 blocks or for about 400–500 m or for 5 min | 79.9% (0.401) | 80.0% (0.400) | 79.4% (0.405) | 0.758 |
| N | 1746 | 1426 | 320 |
Mean values are reported. SD are included in brackets.
The sample size for aircraft noise is significantly smaller due to missingness in noise levels (N=727, with 403 in the control group and 324 in the treatment group).
Details of the samples with and without complete noise information can be found in online supplemental appendix 2.
Stars represent statistical significance, as follows: *p<0.05; **p<0.01; ***p<0.001.
CES-D, Centre for Epidemiologic Studies—Depression.