condition mean min max ZT0-3 7.9213 6.007985 9.376095 ZT4-7 5.614865 5.614865 5.614865 ZT8-11 7.005625 7.005625 7.005625 ZT12-15 12.604675 12.1335 13.075849999999999 ZT16-19 12.4038 12.4038 12.4038 ZT20-23 12.7652 12.7652 12.7652