condition mean min max ZT0-3 10.757327499999999 10.493705 11.02095 ZT4-7 19.826050000000002 19.826050000000002 19.826050000000002 ZT8-11 27.9693 27.9693 27.9693 ZT12-15 0 0 0 ZT16-19 31.19605 31.19605 31.19605 ZT20-23 18.501199999999997 18.501199999999997 18.501199999999997