condition mean min max ZT0-3 96.18605 96.18605 96.18605 ZT4-7 61.66055 61.66055 61.66055 ZT8-11 28.1784 28.1784 28.1784 ZT12-15 30.4859 30.4859 30.4859 ZT16-19 51.47755 51.47755 51.47755 ZT20-23 82.2059 82.2059 82.2059