condition mean min max ZT0-3 10.333693333333333 9.16901 11.01225 ZT4-7 8.408655 8.408655 8.408655 ZT8-11 7.613385000000001 7.613385000000001 7.613385000000001 ZT12-15 10.753060000000001 10.06107 11.44505 ZT16-19 8.78613 8.78613 8.78613 ZT20-23 12.8177 12.8177 12.8177