Table 1 Sampling method used to study the Zaghouan population.

From: Prevalence and risk factors of diabetes mellitus and hypertension in North East Tunisia calling for efficient and effective actions

District name

Number of inhabitants 2018

Sample size requireda

Sample size collected

Zaghouan

34,367

87

133

Ezzriba

20,765

53

80

BirMchergua

21,508

53

67

Fahs

43,678

105

97

Nadhour

28,550

59

29

Saouef

12,095

27

14

Total

160,963

383

420

  1. a(Number of inhabitants(district)/Size of Zaghouan population) × 384; 384 is the sample size calculated by Cochran’s formula with a margin of error of 5.0%; The size of Zaghouan population is 160,963.
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