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Table 3 Spearman rank-order correlation coefficients for dust concentrations between the first and second collections for the most frequently detected analytes.a

From: Pesticides in house dust from urban and farmworker households in California: an observational measurement study

Analyte Salinas farmworker homes (n = 14)b Oakland urban homes (n = 12) b All homes (n = 26)c
  Spearman rho
Organophosphates    
   Diazinon 0.88** 0.97** 0.92*
   Chlorpyrifos 0.83** -- --
Pyrethroids    
   cis-permethrin 0.78** 1.00** 0.91**
   trans-permethrin 0.70** 1.00** 0.90**
   Allethrin 0.49 0.18 0.36
   Cypermethrin 0.87** 0.89** 0.89**
Synergist Ingredient    
   Piperonyl butoxide 0.77* 0.97** 0.89**
Phthalate Herbicide    
Chlorthal-dimethyl 0.78* -- --
  1. a. Only those homes for which we were able to measure analytes in both dust samples were included in these analyses. b. Spearman correlation coefficients are only provided when analyte DF≥50% in respective locations at each collection. c. Correlation coefficients for all homes are provided when analyte DF≥50% in both locations and collections. ** p ≤ 0.0001, * p < 0.01