condition mean min max ZT0-3 11.309917500000001 9.386535 13.2333 ZT4-7 9.786355 9.786355 9.786355 ZT8-11 12.5948 12.5948 12.5948 ZT12-15 0 0 0 ZT16-19 16.2776 16.2776 16.2776 ZT20-23 11.26215 11.26215 11.26215