condition mean min max ZT0-3 101.925888 101.925888 101.925888 ZT4-7 692.057847 692.057847 692.057847 ZT8-11 994.2161325000001 994.2161325000001 994.2161325000001 ZT12-15 633.1482675 633.1482675 633.1482675 ZT16-19 170.08901450000002 170.08901450000002 170.08901450000002 ZT20-23 121.651993 121.651993 121.651993