condition mean min max ZT0-3 0.9607171666666666 0.371582 1.4314879999999999 ZT4-7 1.0397735 1.0397735 1.0397735 ZT8-11 1.8930179999999999 1.8930179999999999 1.8930179999999999 ZT12-15 1.139538 1.0970659999999999 1.18201 ZT16-19 0.331751 0.331751 0.331751 ZT20-23 0.7626305 0.7626305 0.7626305