condition mean min max ZT0-3 979.923255 979.923255 979.923255 ZT4-7 872.4315040000001 872.4315040000001 872.4315040000001 ZT8-11 935.5578624999999 935.5578624999999 935.5578624999999 ZT12-15 1085.4965240000001 1085.4965240000001 1085.4965240000001 ZT16-19 1004.64374 1004.64374 1004.64374 ZT20-23 804.664734 804.664734 804.664734