condition mean min max ZT0-3 11.242545 11.242545 11.242545 ZT4-7 1.64959 1.64959 1.64959 ZT8-11 2.29704 2.29704 2.29704 ZT12-15 1.8610250000000002 1.8610250000000002 1.8610250000000002 ZT16-19 1.700335 1.700335 1.700335 ZT20-23 16.08615 16.08615 16.08615