condition mean min max ZT0-3 13.799325 12.62345 14.975200000000001 ZT4-7 10.184899999999999 10.184899999999999 10.184899999999999 ZT8-11 9.851189999999999 9.851189999999999 9.851189999999999 ZT12-15 0 0 0 ZT16-19 13.5059 13.5059 13.5059 ZT20-23 13.2193 13.2193 13.2193