condition mean min max ZT0-3 61.632325 58.459900000000005 64.80475 ZT4-7 70.5289 70.5289 70.5289 ZT8-11 68.65205 68.65205 68.65205 ZT12-15 0 0 0 ZT16-19 77.77895000000001 77.77895000000001 77.77895000000001 ZT20-23 96.739 96.739 96.739