condition mean min max ZT0-3 0.1547828135 0.0 0.309565627 ZT4-7 1.04241293375 0.9044943795 1.180331488 ZT8-11 1.936454471 1.4982332635 2.3746756785 ZT12-15 4.299055422 3.156884045 5.441226799000001 ZT16-19 4.75665506975 4.5660550075 4.947255132 ZT20-23 4.89130888675 4.809239087 4.9733786865