condition mean min max ZT0-3 0.9655155 0.649056 1.281975 ZT4-7 0.5881415 0.5881415 0.5881415 ZT8-11 8.230125 8.230125 8.230125 ZT12-15 0 0 0 ZT16-19 2.988295 2.988295 2.988295 ZT20-23 1.409845 1.409845 1.409845