condition mean min max ZT0-3 1.162707 1.162707 1.162707 ZT4-7 0.9422606 0.9422606 0.9422606 ZT8-11 1.0616355 1.0616355 1.0616355 ZT12-15 0.9965769999999999 0.9965769999999999 0.9965769999999999 ZT16-19 4.1297999999999997e-05 4.1297999999999997e-05 4.1297999999999997e-05 ZT20-23 1.9255473333333333 1.9255473333333333 1.9255473333333333