condition mean min max ZT0-3 17.573275000000002 14.861 20.28555 ZT4-7 12.20325 12.20325 12.20325 ZT8-11 14.7597 14.7597 14.7597 ZT12-15 0 0 0 ZT16-19 21.4996 21.4996 21.4996 ZT20-23 16.51755 16.51755 16.51755