condition mean min max ZT0-3 63.110573 63.110573 63.110573 ZT4-7 76.657043 76.657043 76.657043 ZT8-11 75.60016300000001 75.60016300000001 75.60016300000001 ZT12-15 75.96676450000001 75.96676450000001 75.96676450000001 ZT16-19 73.736639 73.736639 73.736639 ZT20-23 68.93496400000001 68.93496400000001 68.93496400000001