condition mean min max ZT0-3 12.6079 12.6079 12.6079 ZT4-7 12.606100000000001 12.606100000000001 12.606100000000001 ZT8-11 10.698550000000001 10.698550000000001 10.698550000000001 ZT12-15 10.552465 10.552465 10.552465 ZT16-19 13.688633333333334 13.688633333333334 13.688633333333334 ZT20-23 14.2883 14.2883 14.2883