condition mean min max ZT0-3 15.353250000000001 11.51295 17.5206 ZT4-7 9.06973 9.06973 9.06973 ZT8-11 10.709805 10.709805 10.709805 ZT12-15 12.889975 11.4838 14.29615 ZT16-19 13.5517 13.5517 13.5517 ZT20-23 16.0139 16.0139 16.0139