condition mean min max ZT0-3 162.423176 162.423176 162.423176 ZT4-7 145.91692849999998 145.91692849999998 145.91692849999998 ZT8-11 169.839114 169.839114 169.839114 ZT12-15 183.9423075 183.9423075 183.9423075 ZT16-19 159.6104065 159.6104065 159.6104065 ZT20-23 198.4024825 198.4024825 198.4024825