condition mean min max ZT0-3 123.730547 123.730547 123.730547 ZT4-7 230.9820215 230.9820215 230.9820215 ZT8-11 253.1349765 253.1349765 253.1349765 ZT12-15 192.9878135 192.9878135 192.9878135 ZT16-19 159.4315575 159.4315575 159.4315575 ZT20-23 155.737326 155.737326 155.737326