condition mean min max ZT0-3 99.001297 99.001297 99.001297 ZT4-7 94.48677950000001 94.48677950000001 94.48677950000001 ZT8-11 78.0669685 78.0669685 78.0669685 ZT12-15 79.110173 79.110173 79.110173 ZT16-19 100.35179500000001 100.35179500000001 100.35179500000001 ZT20-23 115.9886565 115.9886565 115.9886565