condition mean min max ZT0-3 17.066162 17.066162 17.066162 ZT4-7 13.448207 13.448207 13.448207 ZT8-11 12.035168500000001 12.035168500000001 12.035168500000001 ZT12-15 12.2391675 12.2391675 12.2391675 ZT16-19 10.5014085 10.5014085 10.5014085 ZT20-23 10.7329735 10.7329735 10.7329735