condition mean min max ZT0-3 818.340211 818.340211 818.340211 ZT4-7 839.416756 839.416756 839.416756 ZT8-11 830.2934025 830.2934025 830.2934025 ZT12-15 780.3215204999999 780.3215204999999 780.3215204999999 ZT16-19 927.2158354999999 927.2158354999999 927.2158354999999 ZT20-23 780.3975535 780.3975535 780.3975535