condition mean min max ZT0-3 0.34158753125 0.0 0.6831750625 ZT4-7 3.0525167782499993 2.072603757 4.032429799499999 ZT8-11 6.2032342095 4.529186535 7.877281884 ZT12-15 8.98857875975 8.952463712 9.0246938075 ZT16-19 6.2577466 6.06072329 6.4547699099999996 ZT20-23 11.09029876875 8.7206952925 13.459902244999999