condition mean min max ZT0-3 15.233925000000001 14.985600000000002 15.48225 ZT4-7 14.8249 14.8249 14.8249 ZT8-11 9.106085 9.106085 9.106085 ZT12-15 0 0 0 ZT16-19 12.32245 12.32245 12.32245 ZT20-23 13.701 13.701 13.701