Table 1

Estimated differences in observed and predicted rates and counts of intensive care admissions, 2007–2010
Influenza season
2007 (15 weeks) 2008 (16 weeks) 2009 (19 weeks) 2010 (12 weeks)
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)

*Because of small numbers of influenza diagnoses outside of influenza seasons, predicted values were based on a constant mean value outside of influenza seasons. All other predicted values were based on the seasonally oscillating predicted values from the time series model.

Schaffer et al.

Schaffer et al. BMC Public Health 2012 12:869   doi:10.1186/1471-2458-12-869

Open Data