condition mean min max ZT0-3 10.785595 8.314335 12.96865 ZT4-7 11.12723 11.12723 11.12723 ZT8-11 12.6828 12.6828 12.6828 ZT12-15 12.491074999999999 12.145399999999999 12.83675 ZT16-19 12.58055 12.58055 12.58055 ZT20-23 13.6966 13.6966 13.6966