condition mean min max ZT0-3 12.532063333333335 8.52579 17.101100000000002 ZT4-7 8.713995 8.713995 8.713995 ZT8-11 4.307345 4.307345 4.307345 ZT12-15 8.11708 7.676105 8.558055 ZT16-19 7.597595 7.597595 7.597595 ZT20-23 10.355115 10.355115 10.355115