condition mean min max ZT0-3 10.4433 10.4433 10.4433 ZT4-7 9.736895 9.736895 9.736895 ZT8-11 7.987645 7.987645 7.987645 ZT12-15 7.883295 7.883295 7.883295 ZT16-19 10.281130000000001 10.281130000000001 10.281130000000001 ZT20-23 9.765419999999999 9.765419999999999 9.765419999999999