condition mean min max ZT0-3 12875.10429 12875.10429 12875.10429 ZT4-7 10430.6086955 10430.6086955 10430.6086955 ZT8-11 9657.5376715 9657.5376715 9657.5376715 ZT12-15 11345.646065 11345.646065 11345.646065 ZT16-19 12705.02607 12705.02607 12705.02607 ZT20-23 12999.967515 12999.967515 12999.967515