condition mean min max ZT0-3 2.93257 2.561795 3.303345 ZT4-7 2.052035 2.052035 2.052035 ZT8-11 2.32748 2.32748 2.32748 ZT12-15 0 0 0 ZT16-19 2.63283 2.63283 2.63283 ZT20-23 2.5593399999999997 2.5593399999999997 2.5593399999999997