condition mean min max ZT0-3 4.093257201749999 2.4470449345 5.739469468999999 ZT4-7 3.804087704 3.1651920880000004 4.44298332 ZT8-11 4.1787710395 4.1431506124999995 4.2143914665 ZT12-15 8.30037693875 6.3487639715 10.251989906 ZT16-19 10.79645024225 9.5997642345 11.99313625 ZT20-23 19.32228523 16.88622546 21.758345