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Table 2 Characteristics of congenital colour vision defects (CCVD) reported compared with the findings of the current study

From: Prevalence of congenital colour vision deficiency among Black school children in Durban, South Africa

Study Race Instrument used Number Age Overall prevalence (%) Prevalence (95% CI)
M/F M F
Africa
 This study Zulu CVTME 704/601 7–17 2.2 4.2 0.6
 Ugalahi et al. [18] Nigerian Ishihara, FM D-15 769/866 13.9 ± 1.9 2.3 3.8 0.9
 Tabansi et al. [19] Nigerian Ishihara N/R N/R 2.6 N/R N/R
 Abah et al. [21] Nigerian Ishihara 149/178 5–17 1.5 N/R N/R
 Woldeamanuel and Geta [23] Ethiopian Ishihara 844 7–18 (11.75 ± 2.5) 4.1 3.6 0.6
 Mulusew and Yilikal [24] Ethiopian Ishihara 1040 12 ± 2.43 4.2 (95% CI 2.98–5.42) N/R N/R
Asia/Middle East
 Ahsana et al. [5] Iranian Ishihara 1352/1302 N/R N/R 8.73 1.69
 Reddy et al. [22] Indian Ishihara 841/788 10–15 1.9 1.71 0.814
 Rajavi et al. [26] Iranian Ishihara 1069/1081 7–12 (mean, 9.4 ± 1.7) 2.2% (95% CI 1.5–3) 3.5 1
 Niroula and Saha [2] Chhetri Ishihara 474/490 10–19 N/R 3.8 0
 Shrestha et al. [20] Chhetri Ishihara 1050/951 10.35 ± 2.75 M
10.54 ± 2.72 F
2.1 3.9 0
 Napaporn et al. [27] Thai Ishihara 3056 6–7 4.2 3.7 0.5
Europe
 Gallo et al. [28] Italian Ishihara 63 933 11–14 4.8   
 Azizoğlu et al. [29] Turkish Ishihara 823 4–10 3.8   
 Rose et al. [30] Caucasian Ishihara 131 5–18 5.3   
 Birch and Platts [31] Caucasian Ishihara 258/255 3–11 N/R 6.6 0.4
  1. M male, F female, CI confidence interval, N/R not reported