condition mean min max ZT0-3 9.021858 9.021858 9.021858 ZT4-7 10.248207 10.248207 10.248207 ZT8-11 10.411898 10.411898 10.411898 ZT12-15 10.501488 10.501488 10.501488 ZT16-19 9.840870500000001 9.840870500000001 9.840870500000001 ZT20-23 12.2061995 12.2061995 12.2061995