condition mean min max ZT0-3 0.443881 0.443881 0.443881 ZT4-7 0.30709600000000004 0.30709600000000004 0.30709600000000004 ZT8-11 0.9619545 0.9619545 0.9619545 ZT12-15 3.8361099999999997 3.8361099999999997 3.8361099999999997 ZT16-19 2.4827500000000002 2.4827500000000002 2.4827500000000002 ZT20-23 1.166125 1.166125 1.166125