condition mean min max ZT0-3 9.543885 8.766224999999999 10.75515 ZT4-7 7.974164999999999 7.974164999999999 7.974164999999999 ZT8-11 8.19615 8.19615 8.19615 ZT12-15 12.112125 11.2758 12.948450000000001 ZT16-19 9.56115 9.56115 9.56115 ZT20-23 10.52355 10.52355 10.52355