condition mean min max ZT0-3 64.724246 64.724246 64.724246 ZT4-7 97.1706615 97.1706615 97.1706615 ZT8-11 105.403684 105.403684 105.403684 ZT12-15 111.1126945 111.1126945 111.1126945 ZT16-19 74.710243 74.710243 74.710243 ZT20-23 58.150864 58.150864 58.150864