condition mean min max ZT0-3 0.8307384999999999 0.3461865 1.334415 ZT4-7 0.525779 0.525779 0.525779 ZT8-11 1.881565 1.881565 1.881565 ZT12-15 1.80435 1.40927 2.19943 ZT16-19 1.7704849999999999 1.7704849999999999 1.7704849999999999 ZT20-23 1.439505 1.439505 1.439505