condition mean min max ZT0-3 21.84145 18.2004 24.1787 ZT4-7 18.0052 18.0052 18.0052 ZT8-11 18.0263 18.0263 18.0263 ZT12-15 26.1635 23.3891 28.9379 ZT16-19 25.6984 25.6984 25.6984 ZT20-23 21.2408 21.2408 21.2408