condition mean min max ZT0-3 150.616672 150.616672 150.616672 ZT4-7 178.52320500000002 178.52320500000002 178.52320500000002 ZT8-11 160.45354500000002 160.45354500000002 160.45354500000002 ZT12-15 272.399831 272.399831 272.399831 ZT16-19 304.770217 304.770217 304.770217 ZT20-23 428.014046 428.014046 428.014046