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Table 2 Change in total goitre prevalence before* and after** introduction of salt iodation in the 27 originally most iodine deficient districts in Tanzania

From: Tanzania national survey on iodine deficiency: impact after twelve years of salt iodation

Region

District

Total goitre

1980s (%)

6 - 18 years*

Traffic light status

Total goitre

2004 (%)

6 - 18 years**

Traffic light status

Total goitre change in % age points by 2004

Total goitre

2004 (%)

6 - 12 years

Traffic light status

Mbeya

Mbeya

88.0

R

24.2

O

-63.8

19.5

Y

Mbeya

Ileje

86.0

R

15.0

Y

-71.0

11.7

Y

Mbeya

Mbozi

83.0

R

21.0

O

-62.0

17.3

Y

Rukwa

Nkasi

81.0

R

24.9

O

-56.1

17.3

Y

Iringa

Mufindi

80.9

R

31.3

R

-49.6

27.1

O

Morogoro

Ulanga

79.0

R

9.1

Y

-69.9

7.8

Y

Rukwa

Sumbawanga

79.0

R

19.8

Y

-59.2

11.5

Y

Mbeya

Kyela

78.6

R

19.3

Y

-59.3

18.5

Y

Ruvuma

Songea

75.0

R

6.9

Y

-68.1

1.9

G

Rukwa

Mpanda

70.0

R

17.9

Y

-52.1

12.5

Y

Mbeya

Rungwe

68.0

R

19.2

Y

-48.8

15.9

Y

Kagera

Ngara

67.7

R

1.7

G

-66.0

0.8

G

Kigoma

Kasulu

64.0

R

3.8

G

-60.2

2.9

G

Dodoma

Mpwapwa

59.0

R

3.2

G

-55.8

1.6

G

Kigoma

Kibondo

58.2

R

2.7

G

-55.5

5.0

Y

Kilimanjaro

Rombo

54.0

R

3.8

G

-50.2

2.2

G

Kigoma

Kigoma

54.0

R

4.8

G

-49.2

1.4

G

Arusha

Monduli

54.0

R

17.0

Y

-37.0

16.3

Y

Iringa

Makete

49.9

R

18.8

Y

-31.1

13.1

Y

Iringa

Njombe

49.9

R

24.9

O

-25.0

18.0

Y

Mbeya

Chunya

49.2

R

0.0

G

-49.2

0.0

G

Arusha

Arumeru

45.4

R

11.4

Y

-34.0

11.3

Y

Kagera

Biharamulo

42.3

R

1.2

G

-41.1

0.6

G

Ruvuma

Mbinga

36.3

R

5.5

G

-30.8

0.7

G

Iringa

Ludewa

31.3

R

19.1

Y

-12.2

15.9

Y

Kagera

Karagwe

31.2

R

2.7

G

-28.5

1.1

G

Kagera

Bukoba

23.4

O

1.9

G

-21.5

1.1

G

Total

 

60.7

R

12.3

Y

-48.4

9.0

Y

  1. Source: [6] & Bunga et al 1991 TFNC Report No. 1429 An evaluation of the impact of the distributed IOC in Tanzania (Unpublished).
  2. Mann-Whitney U test or paired t-test and Eta squared statistics were used to calculate the magnitude of the intervention's effect. Eta = 0.90, t = 15.43, p < .0001 (two-tailed), 95% CI: 15.43 ± 2.06, n = 27.
  3. Key traffic light alphabetical colour codes: Total goitre prevalence: 0 - 4.9% (not of public health significance) = green (G), 5 - 19.9% (mild) = yellow (Y), 20 - 29.9% (moderate) = orange (O), ≥ 30% (severe) = red (R),