condition mean min max ZT0-3 9.033829 9.033829 9.033829 ZT4-7 10.342445000000001 10.342445000000001 10.342445000000001 ZT8-11 11.6978855 11.6978855 11.6978855 ZT12-15 10.850942 10.850942 10.850942 ZT16-19 10.995607 10.995607 10.995607 ZT20-23 11.7271225 11.7271225 11.7271225