condition mean min max ZT0-3 9.439302 9.439302 9.439302 ZT4-7 10.187565500000002 10.187565500000002 10.187565500000002 ZT8-11 9.883854 9.883854 9.883854 ZT12-15 9.3262765 9.3262765 9.3262765 ZT16-19 9.8373355 9.8373355 9.8373355 ZT20-23 9.823906000000001 9.823906000000001 9.823906000000001