Risk of hospitalisation: comparisons between LAIV recipients and matched unvaccinated children and IIV recipients (between cohorts analysis)
| Season 2013–2014 | Period at risk | Incidence (per 1000 person-years) (95% CI) | Relative risk (95% CI) | |||
| LAIV recipients (n=4718) | Matched unvaccinated children (n=14 085) | Matched IIV recipients (n=4716) | LAIV versus no vaccine | LAIV versus IIV | ||
| Any hospitalisation | 42 days | 231 (193 to 275) n*=127 | 227 (203 to 253) n*=325 | 470 (415 to 531) n*=260 | 0.96 (0.78 to 1.19) | 0.47 (0.37 to 0.58) |
| Hospitalisation for lower respiratory event | 106 (80 to 136) n*=58 | 91 (76 to 108) n*=130 | 197 (162 to 238) n*=109 | 1.07 (0.77 to 1.46) | 0.53 (0.39 to 0.73) | |
| Any hospitalisation | 6 months | 183 (166 to 202) n*=412 | 157 (147 to 168) n*=818 | 251 (230 to 272) n*=567 | 1.09 (0.96 to 1.23) | 0.69 (0.60 to 0.79) |
| Hospitalisation for lower respiratory event | 80 (69 to 93) n*=180 | 67 (60 to 74) n*=346 | 125 (111 to 141) n*=283 | 1.13 (0.94 to 1.37) | 0.64 (0.53 to 0.78) | |