condition mean min max ZT0-3 191.841214 191.841214 191.841214 ZT4-7 198.6688535 198.6688535 198.6688535 ZT8-11 174.07208550000001 174.07208550000001 174.07208550000001 ZT12-15 165.400987 165.400987 165.400987 ZT16-19 180.264652 180.264652 180.264652 ZT20-23 190.4754735 190.4754735 190.4754735