Complement C4 deficiency--a plausible risk factor for non-tuberculous mycobacteria (NTM) infection in apparently immunocompetent patients.

On the other hand, the small sample size may have resulted that some clinically important (OR≥2.00) differences failed to reach significance.

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There was a tendency for more common deficiency of both C4B and C4A in the females NTM patients as compared to female controls but these differences did not reach statistical significance ( Table 3 ).

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