condition mean min max ZT0-3 5.8051433333333335 5.03648 6.59527 ZT4-7 4.651985 4.651985 4.651985 ZT8-11 4.18674 4.18674 4.18674 ZT12-15 5.4292925 5.12249 5.736095 ZT16-19 5.88035 5.88035 5.88035 ZT20-23 7.8451450000000005 7.8451450000000005 7.8451450000000005