Table 1 Estimated differences in observed and predicted rates and counts of intensive care admissions, 2007–2010
| Â | Influenza season | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Â | Â | 2007 (15 weeks) | 2008 (16 weeks) | 2009 (19 weeks) | 2010 (12 weeks) | ||||
| Â | Â | Rate difference per 100,000 (95% CI) | Count difference (95% CI) | Rate difference per 100,000 (95% CI) | Count difference (95% CI) | Rate difference per 100,000 (95% CI) | Count difference (95% CI) | Rate difference per 100,000 (95% CI) | Count difference (95% CI) |
All ages | Influenza only* | 0.25 (0.22 to 0.27) | 17 (15–19) | 0.08 (0.05 to 0.11) | 6 (4 to 8) | 2.56 (2.52 to 2.59) | 182 (180 to 185) | 0.33 (0.31 to 0.35) | 24 (22 to 25) |
|  | Influenza/pneumonia | 1.45 (0.98 to 1.91) | 100 (68 to 132) | 0.045 (−0.41 to 0.50) | 3 (−29 to 35) | 0.98 (0.41 -1.55) | 70 (30 to 111) | −0.05 (−0.48 to 0.38) | −4 (−35 to 28) |
|  | All respiratory | 2.55 (1.96 to 3.13) | 176 (135 to 217) | −0.14 (−0.71 to 0.43) | −10 (−50 to 30) | 0.76 (0.043 to 1.48) | 54 (3 to 105) | −0.039 (−0.58 to 0.50) | −3 (−42 to 36) |
<17 years | Influenza only* | 0.68 (0.62-0.73) | 10 (9 to 11) | 0.34 (0.28 to 0.40) | 5 (4 to 6) | 1.81 (1.75 to 1.88) | 28 (27 to 29) | 0.23 (0.19 to 0.28) | 4 (3 to 4) |
|  | Influenza/pneumonia | 1.12 (0.69 to 1.54) | 17 (11 to 23) | −0.62 (−1.03 to −0.21) | −9 (−16 to −3) | 1.27 (0.76 to 1.79) | 20 (12 to 27) | 0.08 (−0.32 to 0.47) | 1 (−5 to 7) |
|  | All respiratory | 2.11 (1.24 to 2.98) | 32 (19 to 45) | −2.69 (−3.53 to −1.84) | −41 (−54 to −28) | 2.01 (0.96 to 3.07) | 31 (15 to 47) | 0.26 (−0.54 to 1.06) | 4 (−8 to 16) |
17 to 64 years | Influenza only* | 0.07 (0.04.to 0.10) | 3 (2 to 4) | −0.03 (−0.06 to 0.00) | −1 (−3 to 0) | 3.01 (2.97 to 3.05) | 127 (126 to 129) | 0.40 (0.38 to 0.42) | 17 (16 to 18) |
|  | Influenza/pneumonia | 0.62 (0.14 to 1.11) | 25 (6 to 45) | 0.06 (−0.42 to 0.53) | 2 (−17 to 22) | 3.25 (2.66 to 3.84) | 137 (112 to 162) | −0.05 (−0.50 to 0.40) | −2 (−21 to 17) |
|  | All respiratory | 1.36 (0.78 to 1.95) | 56 (32 to 79) | −0.020 (−0.59 to 0.55) | −1 (−24 to 23) | 2.89 (2.18 to 3.60) | 122 (92 to 152) | −0.13 (−0.67 to 0.40) | −6 (−29 to 17) |
≥65 years | Influenza only* | 0.42 (0.34 to 0.49) | 4 (3 to 5) | 0.19 (0.11 to 0.27) | 2 (1 to 3) | 2.79 (2.69 to 2.88) | 28 (27 to 28) | 0.30 (0.24 to 0.36) | 3 (2 to 4) |
|  | Influenza/pneumonia | 6.89 (4.27 to 9.52) | 65 (40 to 90) | 2.47 (−0.08 to 5.02) | 24 (−1 to 49) | −5.60 (−8.80 to −2.40) | −55 (−87 to −24) | −0.03 (−2.45 to 2.39) | 0 (−25 to 25) |
|  | All respiratory | 9.48 (6.15 to 12.81) | 89 (58 to 121) | 4.20 (0.96 to 7.43) | 41 (9 to 72) | −7.78 (−11.84 to −3.72) | −77 (−117 to −37) | −0.11 (−3.18 to 2.96) | −1 (−33 to 30) |