condition mean min max ZT0-3 0.4063007666666667 0.4063007666666667 0.4063007666666667 ZT4-7 0.744356975 0.744356975 0.744356975 ZT8-11 0.7485459999999999 0.7485459999999999 0.7485459999999999 ZT12-15 0.994718 0.994718 0.994718 ZT16-19 0.861376 0.861376 0.861376 ZT20-23 0.834819 0.834819 0.834819