condition mean min max ZT0-3 3.3198932230000002 3.236282327 3.403504119 ZT4-7 3.13187293 2.733184837 3.5305610229999997 ZT8-11 4.572351875750001 4.043098024500001 5.101605727000001 ZT12-15 4.26456585 3.9033573455 4.6257743545 ZT16-19 4.23785564375 3.7296988024999997 4.746012485 ZT20-23 4.95340709375 4.8846816585 5.022132529