condition mean min max ZT0-3 1187.6999999999998 1187.6999999999998 1187.6999999999998 ZT4-7 887.8 887.8 887.8 ZT8-11 764.65 764.65 764.65 ZT12-15 955.0500000000001 955.0500000000001 955.0500000000001 ZT16-19 1062.35 1062.35 1062.35 ZT20-23 1115.75 1115.75 1115.75