condition mean min max ZT0-3 9.348475 9.348475 9.348475 ZT4-7 12.0814 12.0814 12.0814 ZT8-11 8.299005000000001 8.299005000000001 8.299005000000001 ZT12-15 11.07995 11.07995 11.07995 ZT16-19 11.4202 11.4202 11.4202 ZT20-23 14.78185 14.78185 14.78185