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Table 3 Cox PH model summary of the effect of pulse duration on the hazard of pesticide mixture

From: Survival analysis of African catfish and Nile tilapia briefly exposed to complex pesticide mixtures

Pesticide Species df Parameter estimate SE Chi-square Hazard ratio
Atrazine-Mancozeb African catfish* 15 min 1  − .482b .913 .279 .618b
30 min 1  − 1.168b 1.155 1.022 .311b
45 min 1  − 1.138b 1.155 .972 .320b
60 min 3    1.596  
Tilapia* 15 min 1  − .754b .707 1.137 .470b
30 min 1  − .843b .708 1.418 .431b
45 min 1  − .054b .577 .009 .947b
60 min 3    2.397  
Atrazine-Chlorpyrifos African catfish* 15 min 1 .423b .646 .429 1.526b
30 min 1 .559b .627 .795 1.749b
45 min 1 .610b .627 .947 1.840b
60 min 3    1.076  
Tilapia 15 min 1  − 1.931a .571 11.455 .145a
30 min 1  − 1.612a .493 10.675 .199a
45 min 1  − 1.242a .448 7.679 .289a
60 min 3    18.875  
Atrazine-Lambda cyhalothrin African catfish* 15 min 1  − .998b .690 2.092 .369b
30 min 1  − .453b .586 .599 .636b
45 min 1  − .431b .586 .540 .650b
60 min 3    2.194  
Tilapia 15 min 1  − 2.279a .758 9.054 .102a
30 min 1  − 1.561a .568 7.550 .210a
45 min 1  − .793b .444 3.196 .452b
60 min 3    14.563  
Mancozeb-Chlorpyrifos African catfish* 15 min 1  − .741b .866 .732 .477b
30 min 1  − .334b .764 .191 .716b
45 min 1  − .026b .707 .001 .974b
60 min 3    .921  
Tilapia 15 min 1  − 1.303b .678 3.694 .272b
30 min 1  − .925b .613 2.279 .396b
45 min 1  − .932b .613 2.314 .394b
60 min 3    5.206  
Mancozeb-Lambda cyhalothrin African catfish* 15 min 1  − .760b .707 1.154 .468b
30 min 1  − .477b .646 .547 .620b
45 min 1  − .471b .646 .533 .624b
60 min 3    1.361  
Tilapia 15 min 1  − 2.315a .767 9.116 .099a
30 min 1  − 1.549a .581 7.111 .212a
45 min 1  − 1.131a .503 5.051 .323a
60 min 3    14.770  
Chlorpyrifos-Lambda cyhalothrin African catfish* 15 min 1  − 1.144a .534 4.591 .319a
30 min 1  − .834b .502 2.768 .434b
45 min 1  − .557b .457 1.487 .573b
60 min 3    5.718  
Tilapia* 15 min 1  − 2.146a .765 7.868 .117a
30 min 1  − .644b .476 1.828 .525b
45 min 1 .084b .401 .044 1.087b
60 min 3    10.384  
Quaternary African catfish* 15 min 1  − 1.090a .542 4.051 .336a
30 min 1  − .784b .509 2.374 .457b
45 min 1  − .797b .509 2.446 .451b
60 min 3    5.407  
Tilapia* 15 min 1  − 1.268b .817 2.409 .281b
30 min 1  − .855b .707 1.460 .425b
45 min 1  − .326b .606 .290 .722b
60 min 3    3.104  
  1. *Hazard ratio constant with time; a- indicates statistical significance (p < 0.05); b- indicates not significant (p > 0.05)