condition mean min max ZT0-3 0.376199 0.1356495 0.848149 ZT4-7 0.132968 0.132968 0.132968 ZT8-11 0.698855 0.698855 0.698855 ZT12-15 0.873858 0.8732465 0.8744695 ZT16-19 0.2706165 0.2706165 0.2706165 ZT20-23 0.2942725 0.2942725 0.2942725