condition mean min max ZT0-3 885.822669 885.822669 885.822669 ZT4-7 1181.0167225 1181.0167225 1181.0167225 ZT8-11 1035.4439255 1035.4439255 1035.4439255 ZT12-15 1297.162017 1297.162017 1297.162017 ZT16-19 1036.776357 1036.776357 1036.776357 ZT20-23 824.69264 824.69264 824.69264