Table 3 Incident rate ratio (IRR) of household incidence - summary table for influenza-like -illness (ILI), lower respiratory infection (LRTI) and upper respiratory infection (URTI). Registered Population of the RCGP RSC Surveillance Network of primary care practices in UK. 2013/14 Season to 2017/18 Season. Children under 5-years in the household and increasing size were the only statistically significant incident differences across all three conditions· The IRR changed significantly between years for ILI but not for the other groups of conditions
Variable type | Variable detail | Reference group: | ILI (IRR) (95% C.I) | LRTI (IRR) (95% C.I) | URTI (IRR) (95% C.I) |
|---|---|---|---|---|---|
Gender | Female: male ratio | Positive female>male | 1.096 (0·98–1·22) | 1·069 (0·96–1·19) | 1·159 (1·04–1·29) |
Socioeconomic status (SES) | IMD Quintile | Change with improved SES | 0.964 (0·90–1·04) | 0·993 (0·92–1·07) | 0·926 (0·86–1·00) |
Ethnicity | Asian | White ethnicity | 2·933 (2·20–3·90) | 1·207 (0·91–1·61) | 1·871 (1·41–2·49) |
Black | 0·549 (0·30–1·01) | 0·563 (0·30–1·04) | 0·796 (0·43–1·47) | ||
Mixed | 1·368 (0·89–2·10) | 0·922 (0·60–1·41) | 1·020 (0·67–1·56) | ||
Other | 1·295 (0·54–3·08) | 1·081 (0·46–2·57) | 1·355 (0·57–3·22) | ||
Preschool child | Under 5 in Household | No under 5 | 1·616 (1·38–1·89) | 2·404 (2·04–2·83) | 4·461 (3·79–5·25) |
Household size | Household size | For each increase in size | 1·399 (1·31–1·49) | 1·182 (1·11–1·26) | 1·563 (1·47–1·67) |
High risk groups | Asthma | Not present in household | 0·994 (0·78–1·27) | 2·041 (1·60–2·60) | 1·581 (1·52–1·64) |
Immuno-supressed | 1·224 (0·80–1·87) | 1·559 (1·02–2·39) | 0·781 (0·72–0·85) | ||
Respiratory disease | 0·940 (0·58–1·53) | 2·433 (1·50–3·95) | 0·737 (0·67–0·81) | ||
Morbidly obese (BMI > 35) | 1·580 (1·15–2·18) | 1·464 (1·06–2·02) | 1·360 (1·28–1·44) | ||
Coronary heart disease (CHD) | 0·960 (0·71–1·30) | 2·051 (1·52–2·78) | 0·917 (0·87–0·97) | ||
Chronic kidney disease (CKD) | 1·051 (0·69–1·61) | 2·196 (1·43–3·37) | 0·718 (0·65–0·79) | ||
Chronic liver disease | 1·295 (0·98–1·72) | 1·792 (1·35–2·38) | 0·956 (0·91–1·01) | ||
Diabetes | 1·859 (0·91–3·82) | 1·399 (0·68–2·88) | 1·063 (0·91–1·24) | ||
Asplenia | 1.521 (0·78–2·95) | 1·323 (0·68–2·57) | 1·252 (1·11–1·42) | ||
Pregnancy | 0·437 (0·21–0·92) | 1·097 (0·52–2·32) | 1·564 (1·48–1·66) | ||
ONS rural-urban conurbation | Conurbation | City and Town | 0·937 (0·65–1·35) | 1·018 (0·70–1·47) | 0·957 (0·66–1·38) |
Rural | 1·613 (1·25–2·08) | 1·096 (0·85–1·41) | 0·886 (0·69–1·14) | ||
NHS Region | Midlands and East | London | 0·670 (0·44–1·03) | 1·594 (1·06–2·50) | 0·678 (0·44–1·04) |
North | 0·621 (0·43–0·90) | 1·507 (1·04–2·18) | 0·827 (0·57–1·20) | ||
South | 0·778 (0·51–1·18) | 1·116 (0·74–1·69) | 0·709 (0·47–1·08) | ||
Season | 2014–2015 | Reference 2013–2014 | 3·282 (2·20–4·89) | 1·261 (0·85–1·88) | 1·115 (0·75–1·66) |
2015–2016 | 2·751 (1·84–4·12) | 1·033 (0·69–1·55) | 0·920 (0·61–1·38) | ||
2016–2017 | 1·966 (1·29–3·00) | 1·055 (0·69–1·61) | 0·799 (0·52–1·22) | ||
2017–2018 | 5·385 (3·68–7·89) | 1·058 (0·72–1·55) | 0·826 (0·56–1·21) |