Table 1 Descriptive statistics for each differentiated area

Exponentially-rising stage

Incidence rate:

period A

391.84 (92.61)

12.80 (4.00)

43.51 (17.37)

305.63 (26.49)

54.24 (7.10)

92.06 (14.96)

422.98 (64.89)

108.81 (14.51)

151.84 (30.25)

Incidence rate:

period B

439.27 (144.41)

65.82 (14.49)

127.36 (35.99)

268.84 (39.05)

185.73 (23.03)

278.81 (46.23)

400.17 (47.30)

343.79 (44.78)

336.02 (55.31)

N

27

33

9

63

76

33

50

75

35

Continuously-rising stage

Incidence rate:

period B

382.31 (98.17)

27.47 (6.37)

61.97 (13.38)

553.88 (61.45)

123.96 (12.81)

260.76 (37.26)

640.88 (80.93)

244.25 (31.57)

262.87 (23.15)

Incidence rate:

period C

393.74 (91.75)

64.30 (9.43)

63.83 (15.86)

594.92 (77.40)

298.03 (37.70)

474.85 (61.07)

629.70 (51.61)

575.44 (58.24)

723.65 (56.25)

N

40

44

12

56

68

50

46

57

47

Declining stage

Incidence rate: period C

521.47 (104.39)

63.74 (8.87)

99.31 (20.81)

822.64 (76.25)

222.61 (20.98)

430.42 (37.25)

881.98 (58.70)

380.35 (31.43)

582.19 (37.93)

Incidence rate:

period D

291.91 (90.08)

108.98 (21.66)

94.27 (22.14)

303.93 (30.84)

203.43 (24.97)

212.88 (20.88)

315.35 (21.31)

233.54 (22.85)

296.02 (26.93)

N

35

49

22

58

54

61

63

61

77