condition mean min max ZT0-3 29.613599999999998 29.3181 29.9091 ZT4-7 31.4959 31.4959 31.4959 ZT8-11 27.80075 27.80075 27.80075 ZT12-15 0 0 0 ZT16-19 33.16225 33.16225 33.16225 ZT20-23 34.55775 34.55775 34.55775