condition mean min max ZT0-3 0.2916935 0.2104745 0.392009 ZT4-7 0.518249 0.518249 0.518249 ZT8-11 0.55013 0.55013 0.55013 ZT12-15 0.23463267999999998 0.00087486 0.4683905 ZT16-19 0.297875 0.297875 0.297875 ZT20-23 0.472621 0.472621 0.472621