condition mean min max ZT0-3 14.2378 14.2378 14.2378 ZT4-7 9.58718 9.58718 9.58718 ZT8-11 10.6089 10.6089 10.6089 ZT12-15 11.3294 11.3294 11.3294 ZT16-19 15.514499999999998 15.514499999999998 15.514499999999998 ZT20-23 14.21965 14.21965 14.21965