condition mean min max ZT0-3 9.445955000000001 8.36753 10.52438 ZT4-7 10.64885 10.64885 10.64885 ZT8-11 10.91977 10.91977 10.91977 ZT12-15 13.661249999999999 12.873800000000001 14.448699999999999 ZT16-19 16.637566666666665 16.637566666666665 16.637566666666665 ZT20-23 13.1144 13.1144 13.1144