condition mean min max ZT0-3 5.71359 2.118605 8.29133 ZT4-7 2.97246 2.97246 2.97246 ZT8-11 4.659295 4.659295 4.659295 ZT12-15 8.721607500000001 8.31522 9.127995 ZT16-19 10.123370000000001 10.123370000000001 10.123370000000001 ZT20-23 11.226199999999999 11.226199999999999 11.226199999999999