condition mean min max ZT0-3 12.58005 11.9836 13.1765 ZT4-7 15.57725 15.57725 15.57725 ZT8-11 11.298200000000001 11.298200000000001 11.298200000000001 ZT12-15 0 0 0 ZT16-19 12.2956 12.2956 12.2956 ZT20-23 13.79185 13.79185 13.79185