Table 2.
Distribution of Demographic and Socioeconomic Variables Among Included Controls by Mailing Wave in a Case-Control Study of Campylobacter Enteritis, England 2005-6
| Group | 1A | 1B | 1C | ||
|---|---|---|---|---|---|
| First mailing | First reminder | Second reminder | Total§ | ||
| Sex | Female | 56.0% | 49.5% | 51.9% | 53.3% |
| χ2 p = 0.004 | Male | 44.0% | 50.5% | 48.1% | 45.2% |
| Total | 2507 | 703 | 717 | 3927 | |
| Age group | 18-24 | 5.4% | 6.0% | 10.3% | 6.3% |
| χ2 p < 0.001 | 25-34 | 12.6% | 13.1% | 14.8% | 12.9% |
| 35-44 | 19.0% | 20.5% | 24.7% | 20.0% | |
| 45-54 | 20.0% | 21.2% | 20.8% | 20.1% | |
| 55-64 | 20.0% | 19.2% | 15.1% | 18.7% | |
| 65+ | 23.1% | 20.1% | 14.4% | 20.7% | |
| Total | 2507 | 703 | 717 | 3927 | |
| Age at leaving full-time education | < 16 yrs | 28.3% | 30.9% | 26.1% | 28.3% |
| χ2 p = 0.007 | 16 yrs | 29.4% | 29.3% | 34.6% | 30.4% |
| 17 yrs | 9.0% | 9.5% | 8.8% | 9.0% | |
| 18 yrs | 11.5% | 9.1% | 10.3% | 10.9% | |
| 19 yrs | 20.5% | 19.2% | 17.1% | 19.6% | |
| Still in education | 1.3% | 1.9% | 3.1% | 1.8% | |
| Total† | 2463 | 692 | 706 | 3861 | |
| IMD quintile | 1 (most deprived) | 15.2% | 18.4% | 19.0% | 16.5% |
| χ2 p = 0.056 | 2 | 16.0% | 14.8% | 18.6% | 16.2% |
| 3 | 20.3% | 18.8% | 19.0% | 19.8% | |
| 4 | 22.5% | 21.2% | 19.0% | 21.6% | |
| 5 | 26.0% | 26.8% | 24.4% | 25.9% | |
| Total‡ | 2483 | 697 | 710 | 3890 | |
§ 56 individuals could not be assigned to any group due to missing date information
† Age at leaving full-time education was missing for 66 individuals
‡ IMD quintile was missing for 71 individuals