condition mean min max ZT0-3 0.0562959475 0.021549252999999997 0.09104264200000001 ZT4-7 0.24047948775 0.1763945915 0.30456438399999997 ZT8-11 0.54531839275 0.312823848 0.7778129375 ZT12-15 2.39645686025 1.6539066244999998 3.1390070960000003 ZT16-19 2.02251712525 1.780799823 2.2642344275 ZT20-23 3.043385228 2.733339041 3.353431415