condition mean min max ZT0-3 6.842045000000001 6.842045000000001 6.842045000000001 ZT4-7 4.55979 4.55979 4.55979 ZT8-11 4.85177 4.85177 4.85177 ZT12-15 5.91624 5.91624 5.91624 ZT16-19 8.639835 8.639835 8.639835 ZT20-23 7.45246 7.45246 7.45246