condition mean min max ZT0-3 83.124480575 79.33874318 86.91021797 ZT4-7 59.1379773125 57.907585255 60.368369369999996 ZT8-11 65.94861914250001 60.856301200000004 71.040937085 ZT12-15 62.284169485 58.871566175 65.696772795 ZT16-19 61.15009242 56.87841512 65.42176972 ZT20-23 68.11172831249999 63.50394824999999 72.719508375