condition mean min max ZT0-3 8.394271666666667 7.223115 9.24379 ZT4-7 5.494455 5.494455 5.494455 ZT8-11 4.926075 4.926075 4.926075 ZT12-15 13.944575 10.7363 17.15285 ZT16-19 10.345675 10.345675 10.345675 ZT20-23 11.0299 11.0299 11.0299