Table 1 Characteristics of cohort participants with 0, 1 and multiple episodes of IID during their follow-up time, UK 2008-9
Number of episodes | ||||||||
|---|---|---|---|---|---|---|---|---|
None | Single | Multiple | ||||||
Variable | No. | % | No | % | No | % | χ2 | p |
Age group | ||||||||
<1 year | 24 | 57.1% | 9 | 21.4% | 9 | 21.4% | 180.20 | <0.001 |
1 to 4 years | 182 | 62.5% | 86 | 29.6% | 23 | 7.9% | ||
5 to 14 years | 517 | 82.9% | 90 | 14.4% | 17 | 2.7% | ||
15 to 64 years | 3,357 | 84.5% | 518 | 13.0% | 99 | 2.5% | ||
65+ years | 1,666 | 87.5% | 198 | 10.4% | 41 | 2.2% | ||
Sex | ||||||||
Male | 2,307 | 86.2% | 300 | 11.2% | 69 | 2.6% | 15.92 | <0.001 |
Female | 3,439 | 82.7% | 601 | 14.4% | 120 | 2.9% | ||
NS-SEC1 | ||||||||
Managerial and professional occupations | 2,938 | 82.6% | 514 | 14.5% | 105 | 3.0% | 30.32 | 0.001 |
Intermediate occupations | 256 | 83.1% | 47 | 15.3% | 5 | 1.6% | ||
Small employers and own account workers | 574 | 82.7% | 96 | 13.8% | 24 | 3.5% | ||
Lower supervisory and technical occupations | 620 | 89.5% | 63 | 9.1% | 10 | 1.4% | ||
Semi-routine and routine occupations | 408 | 86.4% | 53 | 11.2% | 11 | 2.3% | ||
Not classifiable | 950 | 85.4% | 128 | 11.5% | 34 | 3.1% | ||
Quintile of deprivation2 | ||||||||
1 (most deprived) | 420 | 87.1% | 49 | 10.2% | 13 | 2.7% | 12.48 | 0.131 |
2 | 644 | 86.2% | 80 | 10.7% | 23 | 3.1% | ||
3 | 1,515 | 83.3% | 247 | 13.6% | 56 | 3.1% | ||
4 | 1,798 | 83.9% | 286 | 13.4% | 58 | 2.7% | ||
5 (least deprived) | 1,366 | 83.1% | 239 | 14.5% | 39 | 2.4% | ||
Urban/rural indicator2 | ||||||||
Urban | 3,445 | 84.5% | 514 | 12.6% | 116 | 2.8% | 15.06 | 0.005 |
Town | 766 | 86.3% | 96 | 10.8% | 26 | 2.9% | ||
Rural | 1,532 | 81.9% | 291 | 15.6% | 47 | 2.5% | ||