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. Author manuscript; available in PMC: 2014 Dec 31.
Published in final edited form as: Int J Infect Dis. 2012 Aug 9;16(11):e793–e798. doi: 10.1016/j.ijid.2012.07.002

Table 4.

Epidemic spells

Covariate Coefficient SE CI
Mean temperature −0.6479 0.0548 (−0.7553, −0.5405)
Total precipitation 0.0002 0.0001 (0.0000, 0.0005)
Density 0 0.0009 (−0.0017, 0.0017)
Time 0.9269 0.0839 (0.7625, 1.0913)
Time2 −0.0819 0.011 (−0.1035, −0.0603)
Drought 6.002 172.4 (−331.9020, 343.9060)
Flood −0.1424 0.3854 (−0.8978, 0.6130)
Storm −0.3812 0.2279 (−0.8279, 0.0655)

SE, standard error; CI, confidence interval.

‘Time’ is the linear term for time whereas ‘Time2’ is the quadratic term. Inclusion of the quadratic term allows the effect of time to vary non-linearly.