condition mean min max ZT0-3 3.4283675000000002 3.102115 3.75462 ZT4-7 3.84452 3.84452 3.84452 ZT8-11 7.4976199999999995 7.4976199999999995 7.4976199999999995 ZT12-15 0 0 0 ZT16-19 7.747025000000001 7.747025000000001 7.747025000000001 ZT20-23 5.1780349999999995 5.1780349999999995 5.1780349999999995