condition mean min max ZT0-3 31.21295 31.21295 31.21295 ZT4-7 23.31635 23.31635 23.31635 ZT8-11 25.057850000000002 25.057850000000002 25.057850000000002 ZT12-15 30.654000000000003 30.654000000000003 30.654000000000003 ZT16-19 36.95815 36.95815 36.95815 ZT20-23 36.72855 36.72855 36.72855