Table 3. Summer seasonal amplitude of pulmonary TB cases in Wuhan, 2004–2013.

Group		Summer peak/trough month	Seasonal amplitude (%)	SE(%)	95%CI(%) lower	95%CI(%) upper	P value
All PTB cases		Sep/Dec	43.40	6.14	28.88	57.92
Period	Year 2004–2008	Sep/Dec	60.11	5.12	45.90	74.32	0.000§
	Year 2009–2013	Sep/Dec	26.68	1.99	21.16	32.20
Sex	Male	Sep/Dec	42.19	7.08	25.45	58.93	0.389§
	Female	Sep/Dec	49.83	4.98	38.05	61.61
Age(years)	0–14	July/Dec	100.09	14.91	64.83	135.35	0.003¶
	15–24	Sep/Dec	73.69	9.38	51.51	95.87
	25–44	Sep/Dec	36.05	6.09	21.65	50.45
	45–64	Aug/Dec	44.19	7.65	26.10	62.28
	65+	Aug/Dec	57.61	9.49	35.17	80.05
Occupation	Peasant	Aug/Dec	49.84	7.69	31.65	68.03	0.003¶
	Migrant worker	Sep/Dec	55.16	17.39	14.03	96.29
	Worker	July/Dec	43.40	6.83	27.25	59.55
	Student	Sep/Dec	109.88	15.91	72.25	147.51
District	Center	Sep/Dec	44.05	8.24	24.56	63.54	0.545§
	Far	Aug/Dec	50.34	5.99	36.17	64.51
Sputum smear	Positive TB	Sep/Dec	58.23	6.74	42.29	74.17	0.112§
	Negative TB	Sep/Dec	41.52	7.41	24.00	59.04

Abbreviation:SE,standard error;CI,confidence interval.

^§Two-tailed two dependent samples Student's t-test for difference in seasonal amplitudes.

^¶Kruskal-Wallis test for all pairwise multiple comparison among seasonal amplitudes.