condition mean min max ZT0-3 9.1741225 9.03096 9.317285 ZT4-7 16.9906 16.9906 16.9906 ZT8-11 18.193350000000002 18.193350000000002 18.193350000000002 ZT12-15 0 0 0 ZT16-19 11.710745 11.710745 11.710745 ZT20-23 14.0127 14.0127 14.0127