condition mean min max ZT0-3 10.331801 10.331801 10.331801 ZT4-7 10.9329575 10.9329575 10.9329575 ZT8-11 10.0396985 10.0396985 10.0396985 ZT12-15 10.950624 10.950624 10.950624 ZT16-19 9.017063499999999 9.017063499999999 9.017063499999999 ZT20-23 10.590989 10.590989 10.590989