Table 2.
Numbers of outcome events and event rates in intervention and control homes
| Intervention homes | Control homes | Weighted rate difference (95% CI) | P value | ||||
|---|---|---|---|---|---|---|---|
| No of events | Events per resident | No of events | Events per resident | ||||
| Year 1 | |||||||
| Period of influenza activity: | |||||||
| No of residents | n=1249* | n=1323* | — | — | |||
| Death | 140 | 0.112 | 203 | 0.153 | −0.05 (−0.07 to −0.02) | 0.002 | |
| Influenza-like illness | 142 | 0.114 | 300 | 0.227 | −0.09 (−0.14 to −0.03) | 0.004 | |
| General practitioner consultations for influenza-like illness | 125 | 0.100 | 247 | 0.187 | −0.07 (−0.12 to −0.02) | 0.002 | |
| Admissions to hospital | 105 | 0.084 | 144 | 0.109 | −0.02 (−0.05 to 0.02) | 0.35 | |
| Admissions with influenza-like illness | 4 | 0.003 | 23 | 0.017 | −0.02 (−0.03 to 0.00) | 0.009 | |
| Death with influenza-like illness | 13 | 0.010 | 19 | 0.014 | −0.01 (−0.02 to 0.01) | 0.24 | |
| Period of no activity: | |||||||
| No of residents | n=1176* | n=1284* | — | — | |||
| Death | 97 | 0.082 | 94 | 0.073 | 0.00 (−0.03 to 0.03) | 0.93 | |
| Influenza-like illness | 114 | 0.097 | 114 | 0.089 | 0.00 (−0.05 to 0.05) | 0.93 | |
| General practitioner consultations for influenza-like illness | 87 | 0.074 | 99 | 0.077 | −0.01 (−0.06 to 0.041) | 0.74 | |
| Admissions to hospital | 77 | 0.065 | 86 | 0.067 | 0.00 (−0.04 to 0.03) | 0.80 | |
| Admissions with influenza-like illness | 3 | 0.003 | 8 | 0.006 | −0.01 (−0.02 to 0.01) | 0.32 | |
| Death with influenza-like illness | 6 | 0.005 | 7 | 0.005 | −0.01 (−0.04 to 0.02) | 0.59 | |
| Year 2 | |||||||
| Period of influenza activity: | |||||||
| No of residents | n=1231* | n=1348* | — | — | |||
| Death | 99 | 0.080 | 123 | 0.091 | −0.01 (−0.04 to 0.02) | 0.49 | |
| Influenza-like illness | 149 | 0.121 | 179 | 0.133 | 0.00 (−0.06 to 0.06) | 0.93 | |
| General practitioner consultations for influenza-like illness | 124 | 0.101 | 155 | 0.115 | −0.01 (−0.07 to 0.05) | 0.77 | |
| Admissions to hospital | 93 | 0.076 | 102 | 0.076 | −0.00 (−0.03 to 0.04) | 0.84 | |
| Admissions with influenza-like illness | 12 | 0.010 | 9 | 0.007 | 0.00 (−0.02 to 0.02) | 0.99 | |
| Death with influenza-like illness | 4 | 0.003 | 14 | 0.010 | −0.01 (−0.03 to 0.00) | 0.08 | |
| Period of no activity: | |||||||
| No of residents | n=1219* | n=1326* | — | — | |||
| Death | 165 | 0.135 | 159 | 0.120 | 0.01 (−0.03 to 0.04) | 0.70 | |
| Influenza-like illness | 247 | 0.203 | 243 | 0.183 | 0.03 (−0.07 to 0.12) | 0.57 | |
| General practitioner consultations for influenza-like illness | 177 | 0.145 | 211 | 0.159 | 0.00 (−0.08 to 0.08) | 0.95 | |
| Admissions to hospital | 123 | 0.101 | 134 | 0.101 | 0.00 (−0.03 to 0.03) | 0.86 | |
| Admissions with influenza-like illness | 12 | 0.010 | 8 | 0.006 | 0.01 (0.00 to 0.02) | 0.31 | |
| Death with influenza-like illness | 12 | 0.010 | 6 | 0.005 | 0.01 (−0.01 to 0.02) | 0.35 | |
*Average number of residents per day in homes during period.