Table 3.

Estimated numbers and attack rates of influenza-associated outpatient visits by age groups and time periods, Beijing, 2015–2016 season

Age groups (years)	Total 1 year season 2015–2016						Epidemic weeks of season 2015–2016*
	Estimated numbers of influenza-associated outpatient visits	95% CI		Attack rate (%)	95% CI		Estimated numbers of influenza-associated outpatient visits	95% CI		Percentage (%)§	95% CI
0–4	119 400	82 700	156 100	15·4	10·6	20·1	106 700	96 600	116 800	89·4	87·2	91·6
5–14	90 500	13 800	117 500	7·8	1·2	10·2	76 800	65 000	88 500	84·8	82·3	87·3
15–24	51 300	7800	66 600	1·3	0·2	1·7	44 800	38 300	51 400	87·5	85·3	89·6
25–59	155 900	23 600	202 300	1·2	0·2	1·6	135 000	115 400	154 600	86·6	85·4	87·8
60+	51 200	8000	66 900	1·8	0·3	2·4	39 700	31 300	48 100	77·5	74·5	80·6
Overall	468 300	70 700	606 800	2·2	0·3	2·8	403 000	351 800	454 300	86·1	85·0	87·1

^*We defined the first to 15th week of 2016 as the epidemic weeks of the season 2015–2016.

^§The percentage was calculated by dividing estimated influenza-associated outpatient visits during the epidemic weeks by estimated influenza-associated outpatient visits during total 1 year of the season 2015–2016.