condition mean min max ZT0-3 31.033275000000003 25.35495 36.711600000000004 ZT4-7 13.19435 13.19435 13.19435 ZT8-11 10.567499999999999 10.567499999999999 10.567499999999999 ZT12-15 0 0 0 ZT16-19 12.77802 12.77802 12.77802 ZT20-23 18.4636 18.4636 18.4636