Figure 1Time series plot of raw data of confirmed cases.
Figure 2Time series plot of raw data of suspected cases.
Figure 3Monthly means of pertussis cases reported in Iran.
Figure 4Seasonal pattern of pertussis cases reported in Iran, 2011–2013.
Table 1Seasonal differences in incidence of pertussis cases reported by age group in Iran.
Variable
|
Spring
|
Summer
|
Autumn
|
Winter
|
ANOVA/Kruskal–Wallis
|
|
|
Mean |
SD |
Mean |
SD |
Mean |
SD |
Mean |
SD |
p
|
Total of pertussis cases reported |
<2 mo |
28 |
17.4 |
24.1 |
13.7 |
18.1 |
15.4 |
34.1 |
10.4 |
0.142 |
2–11 mo |
41.6 |
24.3 |
33.3 |
19.3 |
30.3 |
21.1 |
43.1 |
5.3 |
0.420 |
1–5 y |
11.1 |
3.3 |
15.2 |
6.7 |
13.1 |
5.2 |
12.4 |
3.04 |
0.345 |
6–10 y |
9.8 |
6.6 |
12.7 |
8.05 |
7.6 |
2.9 |
8.7 |
2.4 |
0.257 |
>10 y |
16.9 |
12.5 |
19.7 |
11.8 |
10.9 |
6.2 |
12.6 |
5.4 |
0.212 |
Laboratory confirmed cases |
<2 mo |
4.4 |
5.1 |
4.3 |
6.02 |
1 |
0.87 |
1.22 |
1.3 |
0.134 |
2–11 mo |
2.9 |
2.9 |
4.3 |
5.2 |
0.33 |
0.5 |
1.33 |
1.3 |
0.046 |
1–5 y |
0.44 |
0.72 |
1.57 |
2.2 |
0.22 |
0.44 |
0.11 |
1.23 |
0.55 |
6–10 y |
0.78 |
1.09 |
1 |
1.3 |
0 |
– |
0 |
– |
0.032 |
>10 y |
1.4 |
1.9 |
0.8 |
1.6 |
0.22 |
0.4 |
0.1 |
0.3 |
0.125 |
Clinically suspected cases |
<2 mo |
23.6 |
16.9 |
19.8 |
11.7 |
17.1 |
15.6 |
32.9 |
10.9 |
0.111 |
2–11 mo |
38.7 |
24.7 |
29 |
16.9 |
30 |
21.3 |
41.8 |
5.02 |
0.384 |
1–5 y |
10.7 |
3.2 |
13.7 |
5.4 |
12.9 |
5.3 |
12.3 |
3.1 |
0.533 |
6–10 y |
9 |
5.6 |
11.7 |
7.8 |
7.6 |
2.9 |
8.7 |
2.4 |
0.397 |
>10 y |
15.4 |
11.2 |
18.9 |
11.6 |
10.7 |
6.2 |
12.4 |
5.2 |
0.250 |