condition mean min max ZT0-3 14.551116666666667 12.933800000000002 16.7389 ZT4-7 9.23199 9.23199 9.23199 ZT8-11 14.298449999999999 14.298449999999999 14.298449999999999 ZT12-15 12.4050075 10.972215 13.8378 ZT16-19 13.225249999999999 13.225249999999999 13.225249999999999 ZT20-23 17.2487 17.2487 17.2487