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Table 3 Agreement calculated with Cohen’s kappa between intensity categories based on EPG and frequency matched categories for PCR DNA copy numbers

From: Comparison of real-time PCR and the Kato-Katz method for the diagnosis of soil-transmitted helminthiasis and assessment of cure in a randomized controlled trial

  Kappa P value Agreement Weighted Kappa
Trichuris trichiura
 Baseline 0.33  < 0.001 71.6% 0.35
 Follow-up 0.61  < 0.001 79.4% 0.63
Hookworm
 Baseline 0.50  < 0.001 75.3% 0.50
 Follow-up 0.47  < 0.001 85.0% 0.47
Ascaris lumbricoides
 Baseline 0.45  < 0.001 63.8% 0.57
 Follow-up 0.74  < 0.001 98.8% 0.74
  1. Intensity classes of infection calculated in eggs per gram (EPG) for: T. trichiura light (1–999); moderate 1,000–9,999, and heavy ≥ 10,000; for hookworm: light (1–1,999), moderate (2,000–3,999), and heavy (≥ 4,000); for A. lumbricoides light (1–4,999), moderate (5,000–49,999), and heavy infection ≥ 50,000