condition mean min max ZT0-3 10.473255 10.473255 10.473255 ZT4-7 4.4091000000000005 4.4091000000000005 4.4091000000000005 ZT8-11 3.593305 3.593305 3.593305 ZT12-15 12.0598 12.0598 12.0598 ZT16-19 12.1116 12.1116 12.1116 ZT20-23 11.44614 11.44614 11.44614