Skip to main content

Advertisement

Table 2 LP, standard deviation, and LP ratios resulting from different recall periods

From: Sampling strategies to measure the prevalence of common recurrent infections in longitudinal studies

  control group intervention group
Model/recall method mean LP SD mean LP SD LP ratio
Model scenario 1 (LS)      
1 day point prevalence recall 0.6% 1.5% 0.5% 1.2% 0.80
3 day point prevalence recall 0.5% 1.3% 0.4% 1.1% 0.80
7 day point prevalence recall 0.4% 1.0% 0.3% 0.8% 0.80
7 day period prevalence recall 1.6% 3.2% 1.3% 2.7% 0.81
Model scenario 2 (LL)      
1 day point prevalence recall 1.3% 3.2% 1.0% 2.7% 0.80
3 day point prevalence recall 1.2% 2.9% 0.9% 2.4% 0.80
7 day point prevalence recall 1.0% 2.4% 0.8% 2.0% 0.80
7 day period prevalence recall 2.4% 5.0% 1.9% 4.2% 0.82
Model scenario 3 (HS)      
1 day point prevalence recall 5.4% 7.3% 4.2% 5.9% 0.80
3 day point prevalence recall 4.9% 6.5% 3.9% 5.2% 0.80
7 day point prevalence recall 4.0% 5.2% 3.2% 4.2% 0.80
7 day period prevalence recall 13.9% 13.9% 11.5% 11.8% 0.84
Model scenario 4 (HL)      
1 day point prevalence recall 11.0% 13.1% 8.9% 11.1% 0.80
3 day point prevalence recall 10.1% 11.9% 8.1% 10.1% 0.80
7 day point prevalence recall 8.2% 9.7% 6.6% 8.2% 0.80
7 day period prevalence recall 19.3% 18.7% 16.0% 16.3% 0.82
  1. Simulated were 2000 individuals allocated to intervention and control group, with a 20% LP reduction in the intervention group (LP ratio= 0.8).