condition mean min max ZT0-3 9.82815 9.82815 9.82815 ZT4-7 10.99835 10.99835 10.99835 ZT8-11 6.02846 6.02846 6.02846 ZT12-15 4.492665000000001 4.492665000000001 4.492665000000001 ZT16-19 5.092805 5.092805 5.092805 ZT20-23 6.12102 6.12102 6.12102