condition mean min max ZT0-3 13.645075 12.70055 14.5896 ZT4-7 9.552710000000001 9.552710000000001 9.552710000000001 ZT8-11 7.732355 7.732355 7.732355 ZT12-15 0 0 0 ZT16-19 13.361 13.361 13.361 ZT20-23 13.568850000000001 13.568850000000001 13.568850000000001