condition mean min max ZT0-3 15.671529999999999 9.06154 21.052599999999998 ZT4-7 6.3091349999999995 6.3091349999999995 6.3091349999999995 ZT8-11 9.767205 9.767205 9.767205 ZT12-15 20.975125000000002 17.1533 24.796950000000002 ZT16-19 25.0294 25.0294 25.0294 ZT20-23 28.536450000000002 28.536450000000002 28.536450000000002