condition mean min max ZT0-3 9.388370926250001 7.6862960125 11.090445840000001 ZT4-7 13.73842011 13.29331256 14.18352766 ZT8-11 15.128599258333335 13.418760350000001 16.838438166666666 ZT12-15 18.071505575000003 17.6021034 18.540907750000002 ZT16-19 17.084814456666667 16.15955213 18.010076783333332 ZT20-23 15.607465213333333 15.445112656666666 15.76981777