condition mean min max ZT0-3 41.2 41.2 41.2 ZT4-7 14.3 14.3 14.3 ZT8-11 23.75 23.75 23.75 ZT12-15 10.6 10.6 10.6 ZT16-19 23.5 23.5 23.5 ZT20-23 6.699999999999999 6.699999999999999 6.699999999999999