condition mean min max ZT0-3 1331.5 1331.5 1331.5 ZT4-7 1353.2 1353.2 1353.2 ZT8-11 1032.65 1032.65 1032.65 ZT12-15 1006.35 1006.35 1006.35 ZT16-19 961.0999999999999 961.0999999999999 961.0999999999999 ZT20-23 1089.0 1089.0 1089.0