condition mean min max ZT0-3 9.980139 9.980139 9.980139 ZT4-7 9.960664000000001 9.960664000000001 9.960664000000001 ZT8-11 9.3363945 9.3363945 9.3363945 ZT12-15 9.2975615 9.2975615 9.2975615 ZT16-19 8.726945 8.726945 8.726945 ZT20-23 8.3293715 8.3293715 8.3293715