condition mean min max ZT0-3 0.71267125 0.51218 0.9131625 ZT4-7 3.742015 3.742015 3.742015 ZT8-11 1.6002585 1.6002585 1.6002585 ZT12-15 0 0 0 ZT16-19 2.1977145 2.1977145 2.1977145 ZT20-23 2.90097 2.90097 2.90097