condition mean min max ZT0-3 7.357398 7.357398 7.357398 ZT4-7 7.947971000000001 7.947971000000001 7.947971000000001 ZT8-11 8.885114999999999 8.885114999999999 8.885114999999999 ZT12-15 9.434833000000001 9.434833000000001 9.434833000000001 ZT16-19 28.1487015 28.1487015 28.1487015 ZT20-23 32.145987500000004 32.145987500000004 32.145987500000004