condition mean min max ZT0-3 13.869929 13.869929 13.869929 ZT4-7 13.239862500000001 13.239862500000001 13.239862500000001 ZT8-11 11.65211 11.65211 11.65211 ZT12-15 11.300359499999999 11.300359499999999 11.300359499999999 ZT16-19 11.4850685 11.4850685 11.4850685 ZT20-23 12.012350999999999 12.012350999999999 12.012350999999999