condition mean min max ZT0-3 49.17165 48.217699999999994 50.125600000000006 ZT4-7 71.57885 71.57885 71.57885 ZT8-11 41.93625 41.93625 41.93625 ZT12-15 0 0 0 ZT16-19 72.1447 72.1447 72.1447 ZT20-23 54.91715000000001 54.91715000000001 54.91715000000001