condition mean min max ZT0-3 16.755603 16.755603 16.755603 ZT4-7 14.688208 14.688208 14.688208 ZT8-11 14.365393999999998 14.365393999999998 14.365393999999998 ZT12-15 15.155735 15.155735 15.155735 ZT16-19 14.895793 14.895793 14.895793 ZT20-23 15.460792999999999 15.460792999999999 15.460792999999999