condition mean min max ZT0-3 10.235135 10.235135 10.235135 ZT4-7 11.580623 11.580623 11.580623 ZT8-11 10.047827999999999 10.047827999999999 10.047827999999999 ZT12-15 9.653347 9.653347 9.653347 ZT16-19 9.453036999999998 9.453036999999998 9.453036999999998 ZT20-23 12.82901 12.82901 12.82901