Table 2 Weekly mean of mortality numbers and proportions of specimens positive for influenza (virus %) during the periods with low, middle and high levels of environmental factors

Temperature

520.5 (81.4)

424.0 (52.1)

407.3 (49.0)

798.6 (73.5)

677.5 (48.6)

655.9 (36.6)

300.5 (61.6)

227.1 (43.6)

213.4 (37.4)

382.7 (47.5)

296.4 (35.3)

275.6 (25.4)

11.3 (4.9)

9.7 (4.3)

9.5 (3.3)

90.8 (15.1)

73.6 (14.1)

72.1 (11.9)

28.0 (7.6)

27.8 (6.9)

28.2 (5.2)

5.6 (5.6)

9.2 (11.9)

7.7 (8.4)

11.1 (9.1)

12.1 (11.7)

13.8 (10.8)

Relative humidity

441.9 (87.7)

441.0 (72.9)

451.9 (64.2)

722.6 (92.4)

693.7 (71.4)

699.7 (71.1)

241.1 (65.5)

239.9 (56.7)

247.1 (54.8)

328.0 (65.6)

306.6 (51.2)

309.9 (49.5)

9.3 (4.1)

10.1 (4.1)

10.6 (4.6)

76.9 (16.8)

77.5 (16.0)

78.0 (14.7)

26.5 (7.7)

28.3 (5.8)

28.7 (7.1)

2.0 (3.3)

7.1 (8.2)

15.8 (12.2)

4.3 (6.4)

14.8 (10.9)

15.2 (10.6)

Vapor pressure

498.2 (91.7)

432.1 (59.8)

413.4 (53.0)

790.8 (79.4)

680.6 (53.8)

657.7 (36.1)

284.4 (68.8)

233.2 (48.2)

217.2 (42.1)

376.0 (53.7)

299.1 (39.0)

277.0 (25.2)

10.6 (5.1)

9.9 (3.6)

9.6 (4.5)

89.2 (16.5)

74.3 (14.3)

72.1 (11.8)

28.2 (7.8)

28.0 (6.7)

27.6 (5.4)

4.3 (5.3)

8.3 (10.5)

10.8 (11.1)

9.9 (9.4)

12.1 (11.2)

14.9 (11.3)