Skip to main content

Table 2 Cox PH model summary of species effect on survival of fingerlings at different pulse exposure duration

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

Pesticide Exposure duration (mins) df Parameter estimate SE Chi-square Pr > ChiSq Hazard ratio
Atrazine-Mancozeb 15* 1 .482 .913 .278 .598 1.619
30* 1 1.179 1.155 1.042 .307 3.252
45* 1 1.958 1.081 3.281 .070 7.088
60* 1 .877 .708 1.533 .216 2.404
Atrazine-Chlorpyrifos 15* 1  − .391 .646 .366 .545 .677
30* 1  − .300 .557 .291 .590 .741
45* 1 .074 .518 .020 .887 1.077
60* 1 1.817 .574 10.027 .002 6.154
Atrazine-Lambda cyhalothrin 15* 1  − .363 .913 .158 .691 .695
30* 1  − .190 .671 .081 .777 .827
45* 1 .670 .572 1.372 .241 1.954
60* 1 .970 .469 4.285 .038 2.639
Mancozeb-Chlorpyrifos 15* 1 .374 .913 .168 .682 1.454
30* 1 .344 .764 .202 .653 1.410
45* 1 .023 .707 .001 .974 1.023
60* 1 .856 .613 1.950 .163 2.354
Mancozeb-Lambda cyhalothrin 15* 1  − .449 .913 .242 .623 .638
30* 1 .027 .707 .001 .970 1.027
45* 1 .546 .646 .714 .398 1.726
60* 1 1.188 .505 5.547 .019 3.282
Chlorpyrifos-Lambda cyhalothrin 15* 1  − .948 .837 1.283 .257 .388
30* 1 .348 .558 .390 .532 1.417
45* 1 .994 .454 4.800 .028 2.703
60* 1 .340 .410 .686 .408 1.405
Quaternary 15* 1  − .920 .837 1.207 .272 .399
30* 1  − .661 .708 .872 .350 .516
45* 1  − .108 .606 .032 .858 .897
60* 1  − .543 .510 1.134 .287 .581
  1. *Hazard ratio constant with time; Pr > ChiSq indicates statistical significance if < 0.05