condition mean min max ZT0-3 23.11933511 21.46634084 24.77232938 ZT4-7 12.94483527125 12.0918513775 13.797819165 ZT8-11 14.535812269999997 12.205618005 16.866006534999997 ZT12-15 11.88881503175 10.490731202 13.286898861500001 ZT16-19 12.08251922925 10.3369471935 13.828091265000001 ZT20-23 19.34908884 16.9741499 21.72402778