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Table 3 Spearman's rank correlations (2-sided significance) for fixed factors. *p < 0.05, **p < 0.01, ***p < 0.005.

From: Toxic effects of brake wear particles on epithelial lung cells in vitro

  Iron Copper Manganese TC OC EC Number Mass
Copper 0.974***        
Manganese 0.991*** 0.960***       
TC 0.500 0.533 0.527      
OC 0.445 0.489 0.467 0.989***     
EC 0.883** 0.811* 0.955*** 0.739 0.739    
Number 0.793*** 0.798*** 0.785*** 0.593* 0.533 0.847*   
Mass 0.815*** 0.780*** 0.811*** 0.451 0.401 0.847* 0.754***  
Surface 0.829*** 0.776*** 0.846*** 0.549 0.478 0.811* 0.824*** 0.952***