condition mean min max ZT0-3 55.981102345 55.564095359999996 56.39810933 ZT4-7 60.11780367750001 58.209377575000005 62.02622978000001 ZT8-11 76.21348501 63.21142774 89.21554228 ZT12-15 141.4174028 131.65365965 151.18114595 ZT16-19 188.977386775 178.2673828 199.68739075000002 ZT20-23 230.10580165 228.50585815 231.70574514999998