condition mean min max ZT0-3 302.374362 302.374362 302.374362 ZT4-7 281.524083 281.524083 281.524083 ZT8-11 288.8116235 288.8116235 288.8116235 ZT12-15 305.31313150000005 305.31313150000005 305.31313150000005 ZT16-19 281.0320375 281.0320375 281.0320375 ZT20-23 303.322242 303.322242 303.322242