Table 7 Districts and regions of Transkei: oesophageal cancer CIRs, ASIRs and significance, 1989–96

From: Changes in the geographical and temporal patterns of cancer incidence among black gold miners working in South Africa, 1964–1996

Region

 

District

Popln. b

CIR

Obs.

Exp. c

ASIR d

Signif. e

OFS

28

Herschela

16 876

35.6

6

1.2

491.8

 
 

10

Matatiele

 

8.6

4

   
 

11

Mt Ayliff

 

0

0

   
 

12

Mt Fletcher

 

11.5

2

   
 

13

Mt Frere

 

22.2

4

   
 

18

Qumbu

 

7.6

1

   
 

21

Tsolo

 

5.0

1

   
 

24

Umzimkulu (not included)

      

East Griqualand

  

121 749

9.9

12

8.8

136.4

 
 

1

Bizana

 

12.9

5

   
 

5

Flagstaff

 

4.3

1

   
 

8

Libode

 

4.1

1

   
 

9

Lusikisiki

 

9.9

2

   
 

15

Ngqeleni

 

15.1

4

   
 

17

Port St Johns

 

27.9

3

   
 

20

Tabankulu

 

6.9

2

   

Pondoland

  

116 557

15.4

18

8.4

213.6

−−

 

3

Elliotdale

 

40.4

4

   
 

4

Engcobo

 

3.8

1

   
 

14

Mqanduli

 

0

0

   
 

19

Cofimvaba

 

20.0

3

   
 

23

Umtata

 

11.4

2

   
 

26

Xalanga

 

31.8

4

   
 

27

Lady Frerea

 

18.6

3

   

Tembuland

  

192 848

8.8

17

13.9

122.0

 
 

2

Golwa (Butterworth)

 

25.1

3

   
 

6

Idutywa

 

18.3

4

   
 

7

Kentani

 

34.4

6

   
 

16

Nqamakwe

 

26.0

5

   
 

22

Tsomo

 

8.0

1

   
 

25

Willowvale

 

26.0

5

   

Transkei Unit

  

102 226

23.5

24

7.4

324.8

++

  

District not known

  

5

   

Transkei

  

550 256

14.9

82

39.8 f

206.2 d

++*

  1. District numbering on the map (Figure 3) follows the earlier mapping (Rose and McGlashan, 1975).
  2. aHerschel and Lady Frere districts were not included as parts of Transkei in 1964–79.
  3. bPopulation in man-years of labour employment.
  4. cExpected on the basis of Transkei truncated age-standardised incidence ratios (ASIR) 206.2.
  5. dLocal ASIR for the region.
  6. eSignificance (by Poisson distribution) high at ++P<0.01, high at −−P<0.05.
  7. fExpected total calculated on all miners' rate.
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