condition mean min max ZT0-3 2.116355 2.116355 2.116355 ZT4-7 0.2908735 0.2908735 0.2908735 ZT8-11 1.1025805 1.1025805 1.1025805 ZT12-15 0.2878215 0.2878215 0.2878215 ZT16-19 2.282315 2.282315 2.282315 ZT20-23 1.3823145000000001 1.3823145000000001 1.3823145000000001