condition mean min max ZT0-3 2.598865 2.39983 2.7979000000000003 ZT4-7 1.1799 1.1799 1.1799 ZT8-11 1.554335 1.554335 1.554335 ZT12-15 0 0 0 ZT16-19 2.654385 2.654385 2.654385 ZT20-23 1.843585 1.843585 1.843585