condition mean min max ZT0-3 2.13755075 1.9538915 2.3212099999999998 ZT4-7 3.1293800000000003 3.1293800000000003 3.1293800000000003 ZT8-11 1.169352 1.169352 1.169352 ZT12-15 0 0 0 ZT16-19 1.53299 1.53299 1.53299 ZT20-23 0.387559 0.387559 0.387559