condition mean min max ZT0-3 711.0 711.0 711.0 ZT4-7 429.0 429.0 429.0 ZT8-11 578.3499999999999 578.3499999999999 578.3499999999999 ZT12-15 960.0500000000001 960.0500000000001 960.0500000000001 ZT16-19 1216.25 1216.25 1216.25 ZT20-23 1097.5 1097.5 1097.5