condition mean min max ZT0-3 2.5985233333333335 2.5985233333333335 2.5985233333333335 ZT4-7 1.70202 1.70202 1.70202 ZT8-11 1.68273 1.68273 1.68273 ZT12-15 1.881865 1.881865 1.881865 ZT16-19 1.336101 1.336101 1.336101 ZT20-23 2.1784499999999998 2.1784499999999998 2.1784499999999998