Table 5. Geographical and temporal variations of major sites of cancer and of all malignancies among black gold miners by home territory, 1964–79 and 1989–96.

			Respiratory					Hepatocellular					Oesophagus					Buccal cavity
Place	Population		CIR	CIR	Obs	Exp from	ASIR	CIR	CIR	Obs	Exp from	ASIR	CIR	CIR	Obs	Exp from	ASIR	CIR	CIR	Obs	Exp from	ASIR
	1989–96	%	1964–79	1989–96	1989–96	1964–79	1989–96	1964–79	1989–96	1989–96	1964–79	1989–96	1964–79	1989–96	1989–96	1964–79	1989–96	1964–79	1989–96	1989–96	1964–79	1989–96
South Africa
Cape	613 167	23.9	4.8	13.0	80	29.2++	148++	11.5	8.8	54	70.5−	105	15.2	16.5	101	93.2	231++	1.1	5.2	32	6.7++	151
TrK	550 256	21.5		11.6	64		130		8.4	46		99	14.6	14.9	82		206++		4.7	26		134
CiK	31 075	1.2		16.1	5		200		9.7	3		122		9.7	3		149		3.2	1		102
Oth	31 836	1.2		34.6	11		485++		15.7	5		212		50.3	16		860++		15.7	5		549
TVL	183 798	7.1	7.7	6.0	11	14.2	81	9.3	3.8	7	17.1−	49−	7.7	7.6	14	14.2	120	1.0	2.2	4	1.9	71
FS	111 381	4.3	4.3	15.3	17	4.8++	244++	2.5	6.3	7	2.8	94	9.2	9.9	11	10.2	189	0.0	8.1	9	0.0++	319+
KZN	167 911	6.6	10.2	4.8	8	21.4−−	141	27.2	6.6	11	45.7−−	135	10.2	7.1	12	17.1	239+	2.6	4.2	7	4.3	278
BOP	202 142	7.9		4.0	8		93		1.0	2		18−−		2.5	5		67		1.0	2		53
Ex-High Commission
BOT	91 079	3.6	1.1	2.2	2	1.0	22−−	2.7	1.1	1	2.5	12−−	3.0	3.3	3	2.7	41	0.8	0.0	0	0.7	0
SWZ & KAN	121 959	4.8	2.4	2.5	3	2.9	46	4.8	6.6	8	5.9	105	1.2	0.0	0	1.5	0−−	0.0	0.0	0	0.0	0
LES	686 770	26.8	1.9	9.3	64	13.3++	79−	5.2	2.8	19	35.7−−	28−−	2.3	2.5	17	15.8	26−−	0.5	2.2	15	3.7++	49−−
Foreign
MOZ	383 513	15.0	1.9	4.7	18	2.2++	32−−	57.0	17.0	65	218.6−−	142+	1.3	1.3	5	5.0	11−−	0.4	2.1	8	1.6	38−−
TNK					30					49					30					17
Total	2 561 720	100	3.1	9.4	241	78.6++	100	18.8	8.7	223	473.3−−	100	6.3	7.7	198	160.1++	100	0.7	3.7	94	16.9++	100
	Colorectal					Leukaemia					Larynx			Stomach				All malignancies
Place	CIR	CIR	Obs	Exp from	ASIR	CIR	CIR	Obs	Exp from	ASIR	CIR	Obs		CIR	CIR	Obs	Exp from	CIR	CIR	Obs	Exp from	ASIR
	1964–79	1989–96	1989–96	1964–79	1989–96	1964–79	1989–96	1989–96	1964–79	1989–96	1989–96	1989–96	ASIR	1964–79	1989–96	1989–96	1964–79	1964–79	1989–96	1989–96	1964–79	1989–96
South Africa
Cape	1.1	1.5	9	6.7	67	0.9	2.9	18	5.3++	134	4.1	25	139+	1.4	2.0	12	8.6	41.4	78.0	478	253.9++	123++
TrK		1.1	6		49		2.9	16		132	3.6	20	152		1.8	10			72.3	398		110
CiK		3.2	1		155		0.0	0		0	9.7	3	452		0.0	0			61.1	19		102
Oth		6.3	2		317		6.3	2		313	6.3	2	330		6.3	2			191.6	61		341++
TVL	1.1	2.7	5	1.8	128	0.5	0.6	1	0.9	26	2.7	5	132	1.0	1.1	2	1.9−	36.0	54.4	100	66.2++	92
FS	0.0	3.6	4	0.0	200	0.0	3.6	4	0.0	190	1.8	2	107	0.6	1.8	2	0.7	19.7	93.4	104	21.9++	184++
KZN	2.6	0.6	1	2.8	44	0.9	0.6	1	1.4	37	1.2	2	131	4.2	1.8	3	7.1	73.0	48.2	81	122.6−−	138+
BOP		1.0	2		63		2.0	4		119	0.0	0	0		0.0	0			18.3	37		45−−
Ex-High Commission
BOT	0.8	2.2	2	0.7	98	1.1	1.1	1	1.0	47	2.2	2	83	1.1	0.0	0	1.1	14.8	28.5	26	13.5+	40−−
SWZ & KAN	0.0	0.0	0	0.0	0	0.0	3.3	4	0.0	180	1.6	2	116	0.0	1.7	2	0.0	16.7	31.2	38	20.4++	67−−
LES	1.1	1.6	11	8.1	63	1.2	0.9	6	8.1	35−−	2.0	14	63	1.0	2.2	15	6.9+	17.2	50.0	343	118.1++	62−−
Foreign
MOZ	0.6	2.9	11	2.4+	95	0.8	2.6	10	3.2+	91	1.8	7	44−−	0.5	0.5	2	1.9	73.3	54.0	207	281.1−−	56−−
TNK			13					8				7				11				331
Total	0.9	2.3	58	22.3++	100	1.0	2.3	57	26.6+	100	2.6	66	100	1.0	1.9	49	25.4++	38.2	68.2	1745	978.6++	100

Poisson significance increase : P<0.05+; P<0.01++. Decrease: P<0.05−; P<0.01−−.

TNK=home territory not known.