condition mean min max ZT0-3 11.563749999999999 11.563749999999999 11.563749999999999 ZT4-7 17.39535 17.39535 17.39535 ZT8-11 14.0123 14.0123 14.0123 ZT12-15 12.0252 12.0252 12.0252 ZT16-19 9.983395 9.983395 9.983395 ZT20-23 8.143650000000001 8.143650000000001 8.143650000000001