# Table 2

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)
Pregnant/ postpartum women Influenza only* 0 0 0 0 9.93 7 1.36 1
Influenza/pneumonia^ 5.27 (4.16 to 6.38) 4 (3 to 4) 3.41 (2.22 to 4.59) 2 (2 to 3) 13.00 (11.59 to 14.40) 9 (8 to 10) 1.09 (0.20 to 1.97) 1 (0 to 1)
All respiratory^ 8.48 (7.04 – 9.91) 6 (5 to 7) 4.95 (3.42 to 6.48) 4 (2 to 5) 14.36 (12.54 to 16.17) 10 (9 to11) 0.15 (−1.00 to 1.30) 0 (−1 to 1)
Aboriginal Influenza only^ −0.19 (−0.41 to 0.02) 0 (−1 to 0) 0.42 (0.19 to 0.65) 1 (0 to 1) 10.86 (10.58 to 11.13) 17 (17 to 18) −0.15 (−0.33 to 0.02) 0 (−1 to 0)
Influenza/pneumonia^ −2.94 (−4.29 to −1.60) −5 (−7 to −2) 7.59 (6.15 to 9.02) 12 (10 to 14) 17.15 (15.45 to 18.85) 27 (25 to 30) 2.15 (1.07 to 3.22) 4 (2 to 5)
All respiratory^ 3.12 (1.05 to 5.19) 5 (2 to 8) 7.85 (5.64 to 10.06) 12 (9 to 16) 17.01 (14.39 to 19.64) 27 (23 to 31) 0.44 (−1.22 to 2.09) 1 (−2 to 3)

*For influenza in pregnant/postpartum women, the rate outside of influenza seasons was zero and therefore no confidence intervals could be calculated.

^Because of small numbers of influenza diagnoses outside of influenza seasons, predicted values were based on a constant mean value outside of influenza seasons.

Schaffer et al.

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