condition mean min max ZT0-3 8.8350925 6.633535 11.03665 ZT4-7 16.3754 16.3754 16.3754 ZT8-11 5.65583 5.65583 5.65583 ZT12-15 0 0 0 ZT16-19 2.4356780000000002 2.4356780000000002 2.4356780000000002 ZT20-23 6.70566 6.70566 6.70566