condition mean min max ZT0-3 78.449532 78.449532 78.449532 ZT4-7 56.393826 56.393826 56.393826 ZT8-11 60.6913665 60.6913665 60.6913665 ZT12-15 73.42866749999999 73.42866749999999 73.42866749999999 ZT16-19 87.4671765 87.4671765 87.4671765 ZT20-23 111.433389 111.433389 111.433389