condition mean min max ZT0-3 22.23985 22.23985 22.23985 ZT4-7 16.453049999999998 16.453049999999998 16.453049999999998 ZT8-11 11.0894 11.0894 11.0894 ZT12-15 12.8408 12.8408 12.8408 ZT16-19 19.11815 19.11815 19.11815 ZT20-23 19.6481 19.6481 19.6481