condition mean min max ZT0-3 1.68861 1.516435 1.860785 ZT4-7 1.428076 1.428076 1.428076 ZT8-11 2.40287 2.40287 2.40287 ZT12-15 0 0 0 ZT16-19 2.1422600000000003 2.1422600000000003 2.1422600000000003 ZT20-23 1.8904200000000002 1.8904200000000002 1.8904200000000002