condition mean min max ZT0-3 65.3 65.3 65.3 ZT4-7 72.1 72.1 72.1 ZT8-11 33.45 33.45 33.45 ZT12-15 64.0 64.0 64.0 ZT16-19 28.849999999999998 28.849999999999998 28.849999999999998 ZT20-23 57.7 57.7 57.7