condition mean min max ZT0-3 47.9239 47.9239 47.9239 ZT4-7 42.40885 42.40885 42.40885 ZT8-11 18.834600000000002 18.834600000000002 18.834600000000002 ZT12-15 23.19085 23.19085 23.19085 ZT16-19 39.5469 39.5469 39.5469 ZT20-23 39.2294 39.2294 39.2294