condition mean min max ZT0-3 277.873867 277.873867 277.873867 ZT4-7 193.16824250000002 193.16824250000002 193.16824250000002 ZT8-11 210.0927765 210.0927765 210.0927765 ZT12-15 219.90360950000002 219.90360950000002 219.90360950000002 ZT16-19 286.62795900000003 286.62795900000003 286.62795900000003 ZT20-23 252.0567355 252.0567355 252.0567355