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. Author manuscript; available in PMC: 2012 Nov 1.
Published in final edited form as: Epidemiology. 2011 Nov;22(6):781–792. doi: 10.1097/EDE.0b013e318231d67a

Table 3.

Effects of Age Group, Gender and Region on the Annual Attack Rate (AR), Case Severity Ratio (CSR), Case Fatality Ratio (CFR), and Severe Case Fatality Ratio (SCFR). Presented are Odds Ratios and 95% Confidence Intervals from Logistic Regression Models.

Year Grouping
Factor1 		Level AR
CSR
CFR
SCFR
OR 95% CI OR 95% CI OR 95% CI OR 95% CI
2008 Age
(1–2.9)		 0–0.9 0.36 0.36, 0.37 1.59 1.36, 1.85 2.48 1.68, 3.66 1.72 1.12, 2.64
3–5.9 0.45 0.45, 0.45 0.55 0.48, 0.64 0.24 0.13, 0.45 0.41 0.22, 0.77
6–9.9 0.061 0.060, 0.062 0.49 0.35, 0.68 0 0
≥10 0.0011 0.0011, 0.0011 0.38 0.20, 0.70 0 0
Gender
(Female)		 Male 1.61 1.60, 1.62 1.13 1.0, 1.27 0.82 0.57, 1.17 0.68 0.46, 1.0
Region2
(CN)		 CS 1.26 1.25, 1.27 0.96 0.83, 1.10 1.43 0.86, 2.37 1.57 0.92, 2.68
S 1.43 1.42, 1.45 1.20 1.03, 1.40 2.47 1.48, 4.10 2.26 1.32, 3.88
NE 1.02 1.01, 1.04 0.60 0.45, 0.79 1.29 0.55, 3.03 2.10 0.84, 5.26
SW 0.46 0.45, 0.47 0.26 0.17, 0.39 0.35 0.08, 1.47 1.78 0.38, 8.29
CW 0.77 0.76, 0.78 0.18 0.10, 0.32 0.50 0.12, 2.13 3.32 0.65,16.88
W 0.37 0.36, 0.38 0.18 0.04, 0.70 1.53 0.21, 11.40 1.98 1.03,381.23
2009 Age
(1–2.9)		 0–0.9 0.42 0.42, 0.42 1.42 1.35, 1.48 2.42 1.92, 3.06 1.85 1.45, 2.36
3–5.9 0.43 0.42, 0.43 0.47 0.45, 0.49 0.26 0.18, 0.37 0.54 0.37, 0.77
6–9.9 0.049 0.048, 0.049 0.30 0.26, 0.34 0.10 0.025, 0.41 0.33 0.080, 1.34
≥10 0.0008 0.0008, 0.0009 0.15 0.11, 0.21 0 0
Gender
(Female)		 Male 1.56 1.56, 1.57 1.10 1.06, 1.14 1.05 0.84, 1.30 0.96 0.77, 1.21
Region2
(CN)		 CS 0.67 0.67, 0.68 0.12 0.11, 0.12 0.63 0.47, 0.84 5.80 4.30, 7.81
S 0.72 0.72, 0.73 0.13 0.12, 0.14 0.72 0.51, 1.02 5.88 4.13, 8.37
NE 0.75 0.75, 0.76 0.17 0.15, 0.19 1.43 0.97, 2.09 8.61 5.78, 12.82
SW 0.24 0.24, 0.24 0.38 0.35, 0.42 2.20 1.55, 3.11 6.15 4.29, 8.81
CW 0.65 0.65, 0.66 0.083 0.071, 0.097 1.19 0.78, 1.83 16.67 10.47,26.53
W 0.21 0.20, 0.21 0.061 0.036, 0.11 0.43 0.06, 3.06 7.64 0.98, 59.77
1

Values in paretheses are reference levels for the ORs.

2

CN= Central North, CS=Central South, S=South, NE=Northeast, SW=Southwest, CW= Central West, W=West.