Count model coefficients (truncated negbin with log link):

Estimate

Std. Error

z value

p-value

(Intercept)

0.63862

0.63717

1.002

0.31621

EID Testing Point

2 - 9 months

0.65677

0.24183

2.716

0.00661**

9 - 12 months

0.20880

0.32211

0.648

0.51685

12 - 24 months

−0.05442

0.39480

−0.138

0.89036

Above 24 months

0.28004

0.28758

0.974

0.33017

PCR Type

Confirmatory PCR

−9.80622

133.47361

−0.073

0.94143

2nd/3rd PCR

0.40607

0.60548

0.671

0.50244

Log(theta)

2.58135

1.18422

2.180

0.02927*