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

Region		District	Popln.b	CIR	Obs.	Exp.c	ASIRd	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	39.8f	206.2d	++*

District numbering on the map (Figure 3) follows the earlier mapping (Rose and McGlashan, 1975).

^aHerschel and Lady Frere districts were not included as parts of Transkei in 1964–79.

^bPopulation in man-years of labour employment.

^cExpected on the basis of Transkei truncated age-standardised incidence ratios (ASIR) 206.2.

^dLocal ASIR for the region.

^eSignificance (by Poisson distribution) high at ⁺⁺P<0.01, high at ⁻⁻P<0.05.

^fExpected total calculated on all miners' rate.