Malawi, South-western health zone (2010)

Malawi, 2010
Southern
Blantyre, Chikwawa, Nsanje, Thyolo, Chiradzulu, Mwanza, Neno
Principal Investigator
Khumbo Kalua
Trainer
Robert Lindfield
Sample size
3583
Response rate
95.7%
RAAB version
RAAB5
Diabetic retinopathy
No
Disability module
No

Vision impairment

Prevalence (age-sex adjusted)

Female
Male
Total
Extrapolated magnitude
%
95% CI
Extrapolated magnitude
%
95% CI
Extrapolated magnitude
%
95% CI
Blind
10 089
3.5
2.5 - 4.5
8 386
3.7
2.6 - 4.9
18 475
3.6
2.8 - 4.4
Severe
7 927
2.7
2.0 - 3.5
7 229
3.2
2.2 - 4.2
15 156
3.0
2.3 - 3.6
Moderate
30 167
10.5
8.9 - 12.0
22 079
9.8
8.0 - 11.7
52 246
10.2
8.9 - 11.4

Cataract

Operable cataract prevalence (age-sex adjusted)

Female
Male
Total
Extrapolated magnitude
%
95% CI
Extrapolated magnitude
%
95% CI
Extrapolated magnitude
%
95% CI
<3/60
4 641
1.6
1.0 - 2.2
2 684
1.2
0.6 - 1.8
7 325
1.4
0.9 - 1.9
<6/60
7 985
2.8
2.0 - 3.5
4 272
1.9
1.2 - 2.6
12 258
2.4
1.8 - 3.0
<6/18
23 474
8.1
6.6 - 9.7
14 103
6.3
4.8 - 7.7
37 576
7.3
6.1 - 8.6

Cataract surgical coverage (CSC) (age-sex adjusted)

Female
Male
Total
%
95% CI
%
95% CI
%
95% CI
CSC<3/60
-
26.8
13.2 - 40.5
-
55.1
40.6 - 40.6
-
40.5
15.4 - 38.2
CSC<6/60
-
19.7
9.4 - 29.9
-
45.0
31.2 - 58.7
-
30.8
10.0 - 29.4
CSC<6/18
-
9.4
4.5 - 14.2
-
20.7
13.3 - 28.2
-
14.0
5.0 - 13.7

Effective cataract surgical coverage (eCSC) (age-sex adjusted)

The RAAB research team are in the process of concluding a formal analysis of eCSC with the World Health Organization and the Vision Loss Expert Group. eCSC results will be available on the repository in 2022.

Notes

Vision impairment categories defined according to WHO thresholds using presenting visual acuity in the better eye.

All prevalence and coverage estimates are adjusted to the age and gender distribution of the population 50 years and older in the survey area.

All 95% confidence intervals adjusted to account for the cluster design of the survey.