condition mean min max ZT0-3 1.1569318268333333 1.0068752736666666 1.30698838 ZT4-7 1.1080163875 0.915978635 1.3000541399999999 ZT8-11 1.34603089 1.146085411 1.545976369 ZT12-15 0.6923793095 0.4951854326666667 0.8895731863333334 ZT16-19 1.2162137716666668 1.1575127163333334 1.2749148270000001 ZT20-23 1.2298100189999999 1.161224734 1.298395304