condition mean min max ZT0-3 9.022254 9.022254 9.022254 ZT4-7 10.745682 10.745682 10.745682 ZT8-11 10.5574355 10.5574355 10.5574355 ZT12-15 11.184883 11.184883 11.184883 ZT16-19 10.21234 10.21234 10.21234 ZT20-23 11.398991500000001 11.398991500000001 11.398991500000001