condition mean min max ZT0-3 7.845748333333333 7.399595 8.155945 ZT4-7 8.843535 8.843535 8.843535 ZT8-11 7.19148 7.19148 7.19148 ZT12-15 10.5508 10.54815 10.553450000000002 ZT16-19 8.778595 8.778595 8.778595 ZT20-23 8.48066 8.48066 8.48066