Table 1 Results of testing for variation in the prevalence of hard spleens and firm livers over time within each sector. Sector is described in the legend to table 1. Q – Cochrans Q statistic, N – number of individuals with relevant data from all time points, p – level of significance.

Sector

N

Q

p

Q

p

A

21

14.0

0.003

13.2

0.004

B

12

9.0

0.029

5.0

0.172

C

15

8.3

0.041

7.8

0.049

D

19

12

0.007

10.7

0.013