condition mean min max ZT0-3 1235.270518 1235.270518 1235.270518 ZT4-7 1130.383779 1130.383779 1130.383779 ZT8-11 1095.6866295 1095.6866295 1095.6866295 ZT12-15 1314.639178 1314.639178 1314.639178 ZT16-19 1256.8399880000002 1256.8399880000002 1256.8399880000002 ZT20-23 1550.3561255 1550.3561255 1550.3561255