condition mean min max ZT0-3 5.290683366250001 4.7441814205 5.837185312000001 ZT4-7 3.05440906175 2.5970069555000004 3.5118111679999995 ZT8-11 4.364537361 3.8199713515 4.9091033705000005 ZT12-15 4.9576290105 4.1007972145 5.8144608065 ZT16-19 5.359976589 4.9350218485 5.7849313295 ZT20-23 7.527831045 6.7941610699999995 8.26150102