condition mean min max ZT0-3 0.49370200000000003 0.0 1.195645 ZT4-7 1.861445 1.861445 1.861445 ZT8-11 1.3250845 1.3250845 1.3250845 ZT12-15 2.0061475 1.7038449999999998 2.30845 ZT16-19 1.5540500000000002 1.5540500000000002 1.5540500000000002 ZT20-23 1.41767 1.41767 1.41767