condition mean min max ZT0-3 1427.3000000000002 1427.3000000000002 1427.3000000000002 ZT4-7 1038.0 1038.0 1038.0 ZT8-11 1159.2 1159.2 1159.2 ZT12-15 955.3000000000001 955.3000000000001 955.3000000000001 ZT16-19 1141.75 1141.75 1141.75 ZT20-23 1278.45 1278.45 1278.45