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Br J Ophthalmol 82:510-516 doi:10.1136/bjo.82.5.510
  • Original Article
    • Clinical science

Blue-yellow colour vision in an onchocercal area of northern Nigeria

Table 3

Crude and adjusted odds of failing the City University Tritan Test by degree of skin snip positivity, in an onchocercal area, northern Nigeria

Screening plates Grading plates
Skin snip
(mf/mg skin)
Crude odds
(95% CI)
Adjusted odds
(95% CI)
Crude odds
(95% CI)
Adjusted odds
(95% CI)
Negative 1.00 1.00 1.00 1.00
1–10 2.36 (1.94–2.86) 0.98 (0.70–1.39) 3.18 (2.47–4.10) 0.92 (0.46–1.83)
11–50 3.63 (2.94–4.47) 1.52 (1.05–2.20) 4.76 (3.63–6.24) 1.46 (0.72–2.95)
51+ 4.20 (3.10–5.70) 1.90 (1.15–3.14) 4.83 (3.28–7.12) 1.71 (0.68–4.28)
  • Adjustment after restriction to those with visual acuities of better than 3/60 for sex, age, ethnic group, education, occupation, religion, alcohol and diethylcarbamazine consumption, visual acuity, and diagnosis of cataract and optic nerve disease.

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