condition mean min max ZT0-3 34.575143 34.575143 34.575143 ZT4-7 37.8218065 37.8218065 37.8218065 ZT8-11 51.244119 51.244119 51.244119 ZT12-15 41.4207115 41.4207115 41.4207115 ZT16-19 49.601803000000004 49.601803000000004 49.601803000000004 ZT20-23 48.059936500000006 48.059936500000006 48.059936500000006