condition mean min max ZT0-3 7.1319925 5.687250000000001 8.576735 ZT4-7 16.00865 16.00865 16.00865 ZT8-11 23.75795 23.75795 23.75795 ZT12-15 0 0 0 ZT16-19 25.57645 25.57645 25.57645 ZT20-23 18.85135 18.85135 18.85135