condition mean min max ZT0-3 4.2951422145 3.2606772110000004 5.329607218 ZT4-7 5.8133183737500005 5.574937515 6.0516992325 ZT8-11 4.741247185 4.396786357 5.085708013 ZT12-15 4.385432618 4.272045043 4.498820193 ZT16-19 4.9964152575 4.237376004 5.755454511 ZT20-23 9.304943592499999 8.083919266999999 10.525967918