condition mean min max ZT0-3 6.48708 1.73499 9.986915 ZT4-7 1.3243800000000001 1.3243800000000001 1.3243800000000001 ZT8-11 1.064996 1.064996 1.064996 ZT12-15 2.52818 1.56466 3.4917 ZT16-19 4.923920000000001 4.923920000000001 4.923920000000001 ZT20-23 10.147405 10.147405 10.147405