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Table 2 Excess risks of mortality per IQR increase of influenza virus activity during four seasons

From: Seasonal effects of influenza on mortality in a subtropical city

Disease lag Total Autumn Winter Spring Summer p value ‡
All-cause        
   all ages 1 3.5
(2.4,4.6)
-0.9
(-5.6,4.2)
3.9
(2.6,5.3)
3.9
(2.5,5.3)
2.3
(0.3,4.3)
<0.001
   65+ 1 4.3
(3.0,5.6)
-1.4
(-7.0,4.5)
4.5
(3.0,6.1)
4.5
(2.9,6.1)
3.8
(1.4,6.3)
0.005
CRD        
   all ages 2 6.5
(4.8,8.2)
-1.2
(-7.4,5.4)
8.0
(5.8,10.2)
6.5
(4.5,8.6)
3.6
(0.4,7.0)
<0.001
   65+ 1 6.7
(4.9,8.5)
-2.0
(-10.0,6.8)
7.3
(5.2,9.6)
7.0
(4.7,9.4)
5.0
(1.5,8.5)
<0.001
P&I        
   all ages 1 4.2
(1.5,6.9)
1.0
(-11.9,15.8)
4.2
(0.9,7.7)
3.0
(-0.5,6.5)
5.8
(0.8,11.0)
0.224
   65+ 1 4.3
(1.6,7.1)
0.6
(-12.6,15.8)
4.1
(0.7,7.6)
2.8
(-0.7,6.4)
6.7
(1.6,12.1)
0.156
COPD        
   all ages 2 14.9
(11.0,19.0)
-7.0
(-20.3,8.5)
18.8
(13.8,24.1)
14.3
(9.6,19.2)
9.4
(1.8,17.6)
<0.001
   65+ 2 13.7
(9.7,17.9)
-9.0
(-22.6,6.9)
17.0
(11.9,22.3)
13.1
(8.3,18.1)
9.7
(1.7,18.3)
<0.001
Cerebrovascular        
   all ages 1 6.3
(3.2,9.5)
-1.9
(-14.9,13.2)
5.5
(1.9,9.3)
8.3
(4.3,12.4)
6.1
(0.0,12.5)
0.001
   65+ 1 7.3
(3.9,10.9)
-3.8
(-17.9,12.7)
6.2
(2.2,10.4)
10.4
(5.9,15.0)
6.6
(-0.1,13.8)
0.001
IHD        
   all ages 0 6.0
(3.5,8.6)
0.9
(-12.3,16.2)
6.3
(3.4,9.3)
6.7
(3.3,10.2)
4.4
(-0.3,9.3)
0.021
   65+ 0 5.6
(2.9,8.3)
-2.9
(-16.7,13.2)
5.8
(2.7,9.1)
5.9
(2.3,9.7)
4.4
(-0.7,9.8)
0.015
  1. The 95% confidence intervals of excess risks are shown in brackets.
  2. p value of likelihood ratio tests, indicating significance of seasonal variation