condition mean min max ZT0-3 1.5466225 1.3250549999999999 1.7681900000000002 ZT4-7 3.831235 3.831235 3.831235 ZT8-11 8.62835 8.62835 8.62835 ZT12-15 0 0 0 ZT16-19 5.1367 5.1367 5.1367 ZT20-23 2.3168800000000003 2.3168800000000003 2.3168800000000003