condition mean min max ZT0-3 15.341971 15.341971 15.341971 ZT4-7 13.5887645 13.5887645 13.5887645 ZT8-11 11.144306 11.144306 11.144306 ZT12-15 13.940072 13.940072 13.940072 ZT16-19 10.0047905 10.0047905 10.0047905 ZT20-23 10.699492 10.699492 10.699492