condition mean min max ZT0-3 17.231949999999998 17.231949999999998 17.231949999999998 ZT4-7 12.755749999999999 12.755749999999999 12.755749999999999 ZT8-11 23.9111 23.9111 23.9111 ZT12-15 19.715049999999998 19.715049999999998 19.715049999999998 ZT16-19 29.10305 29.10305 29.10305 ZT20-23 23.5372 23.5372 23.5372