condition mean min max ZT0-3 6.3356125 6.00764 6.663584999999999 ZT4-7 5.22447 5.22447 5.22447 ZT8-11 6.20808 6.20808 6.20808 ZT12-15 8.269243750000001 7.6851375 8.85335 ZT16-19 7.204691666666667 6.55375 7.8556333333333335 ZT20-23 0 0 0