condition mean min max ZT0-3 26.18 26.18 26.18 ZT4-7 17.10625 17.10625 17.10625 ZT8-11 22.4004 22.4004 22.4004 ZT12-15 25.8292 25.8292 25.8292 ZT16-19 27.34505 27.34505 27.34505 ZT20-23 24.0912 24.0912 24.0912