condition mean min max ZT0-3 3.1948179800000003 2.9786971270000002 3.4109388330000003 ZT4-7 0.2488846 0.1866277855 0.3111414145 ZT8-11 1.3607042605 0.1195491965 2.6018593245 ZT12-15 3.714836681 3.3011770030000003 4.128496359 ZT16-19 4.8995323630000005 4.834711079000001 4.964353647 ZT20-23 5.9918042605 5.1222045155 6.8614040055