condition mean min max ZT0-3 83.693922 83.693922 83.693922 ZT4-7 84.69908050000001 84.69908050000001 84.69908050000001 ZT8-11 83.3272905 83.3272905 83.3272905 ZT12-15 70.668211 70.668211 70.668211 ZT16-19 97.06945049999999 97.06945049999999 97.06945049999999 ZT20-23 104.73860350000001 104.73860350000001 104.73860350000001