Molecular epidemiological analysis of Influenza viruses in Influenza-like illness cases: a retrospective study in Chongqing Hi-Tech Zone, China (2021–2024)

Table 4 Comparison of the distribution of influenza viruses by age group and sex

item	Age group	Number of influenza A virus detections (n)	Influenza A virus χ²	P	Number of detections of influenza B virus (n)	Influenza B virus χ²	P
0 to 10 years	18,752	3275	30.627	< 0.001	1307	5.249	0.036
male	10,865	1856			738
women	7887	1419			569
> 10 ~ 20 years old	3875	545	0.387	0.413	325	0.062	0.629
male	1946	327			182
women	1929	218			143
> 20 ~ 30 years old	2637	236	0.253	0.721	206	0.136	0.658
male	1214	93			89
women	1423	143			117
> 30 ~ 40 years old	3276	258	0.003	0.899	125	0.385	0.472
male	1424	115			53
women	1852	143			72
> 40 ~ 50 years old	1321	57	0.005	0.953	23	0.394	0.437
male	589	23			8
women	732	34			15
> 50 ~ 60 years old	1629	123	0.936	0.547	13	0.649	0.352
male	757	42			4
women	872	81			9
> 60 ~ 70 years old	1753	106	9.978	0.002	21	1.525	0.136
male	697	49			12
women	1056	57			9
> 70 years	1928	47	0.659	0.346	11	0.178	0.459
male	745	21			9
women	1183	26			2

ISSN: 1743-422X