condition mean min max ZT0-3 14.848404 14.848404 14.848404 ZT4-7 12.8377555 12.8377555 12.8377555 ZT8-11 12.427328500000002 12.427328500000002 12.427328500000002 ZT12-15 12.1722735 12.1722735 12.1722735 ZT16-19 10.894006000000001 10.894006000000001 10.894006000000001 ZT20-23 11.36773 11.36773 11.36773