condition mean min max ZT0-3 6.711007499999999 6.286665 7.135349999999999 ZT4-7 6.624525 6.624525 6.624525 ZT8-11 8.939035 8.939035 8.939035 ZT12-15 0 0 0 ZT16-19 6.555925 6.555925 6.555925 ZT20-23 6.67089 6.67089 6.67089