condition mean min max ZT0-3 862.572581 862.572581 862.572581 ZT4-7 931.242092 931.242092 931.242092 ZT8-11 973.7242925 973.7242925 973.7242925 ZT12-15 1123.1228445000002 1123.1228445000002 1123.1228445000002 ZT16-19 1433.5727015 1433.5727015 1433.5727015 ZT20-23 1391.6030495 1391.6030495 1391.6030495