condition mean min max ZT0-3 9.39478 9.39478 9.39478 ZT4-7 7.83811 7.83811 7.83811 ZT8-11 9.296244999999999 9.296244999999999 9.296244999999999 ZT12-15 9.85345 9.85345 9.85345 ZT16-19 11.16095 11.16095 11.16095 ZT20-23 9.28716 9.28716 9.28716