condition mean min max ZT0-3 5.311712750333333 4.823759275333334 5.7996662253333335 ZT4-7 6.023585038833334 5.929703877 6.117466200666667 ZT8-11 6.2822005225 5.862347482 6.702053563 ZT12-15 5.308914071 4.799013964 5.818814178 ZT16-19 5.606399746166667 5.386958552333334 5.82584094 ZT20-23 5.8547650865000005 4.8788640076666665 6.830666165333334