condition mean min max ZT0-3 67.908192 67.908192 67.908192 ZT4-7 74.488216 74.488216 74.488216 ZT8-11 68.7017535 68.7017535 68.7017535 ZT12-15 72.99871350000001 72.99871350000001 72.99871350000001 ZT16-19 70.24328 70.24328 70.24328 ZT20-23 71.71781150000001 71.71781150000001 71.71781150000001