condition mean min max ZT0-3 7.51345 7.51345 7.51345 ZT4-7 4.02408 4.02408 4.02408 ZT8-11 5.71866 5.71866 5.71866 ZT12-15 5.87317 5.87317 5.87317 ZT16-19 13.32275 13.32275 13.32275 ZT20-23 9.462025 9.462025 9.462025