condition mean min max ZT0-3 14.1654 14.1654 14.1654 ZT4-7 14.16865 14.16865 14.16865 ZT8-11 15.85405 15.85405 15.85405 ZT12-15 14.1707 14.1707 14.1707 ZT16-19 18.01085 18.01085 18.01085 ZT20-23 13.95045 13.95045 13.95045