condition mean min max ZT0-3 0.7645203333333332 0.231138 1.163147 ZT4-7 0.0 0.0 0.0 ZT8-11 0.66832 0.66832 0.66832 ZT12-15 0.48954275 0.484745 0.4943405 ZT16-19 0.215989 0.215989 0.215989 ZT20-23 1.67881 1.67881 1.67881