condition mean min max ZT0-3 1.7280175 1.4731550000000002 1.98288 ZT4-7 1.651455 1.651455 1.651455 ZT8-11 2.20945 2.20945 2.20945 ZT12-15 0 0 0 ZT16-19 2.8765099999999997 2.8765099999999997 2.8765099999999997 ZT20-23 2.5098599999999998 2.5098599999999998 2.5098599999999998