condition mean min max ZT0-3 12.467600000000001 12.467600000000001 12.467600000000001 ZT4-7 14.45065 14.45065 14.45065 ZT8-11 11.19615 11.19615 11.19615 ZT12-15 13.053650000000001 13.053650000000001 13.053650000000001 ZT16-19 13.39075 13.39075 13.39075 ZT20-23 13.6905 13.6905 13.6905