condition mean min max ZT0-3 68.7165393775 44.354917365 93.07816139 ZT4-7 33.992479915000004 27.861880635 40.123079195 ZT8-11 50.7680065275 42.83433644 58.701676615 ZT12-15 44.892715405 41.084728459999994 48.70070235 ZT16-19 53.2703162425 48.236946085 58.303686400000004 ZT20-23 100.58534450249999 80.23840545499999 120.93228355