condition mean min max ZT0-3 12.263226666666666 12.263226666666666 12.263226666666666 ZT4-7 12.28906 12.28906 12.28906 ZT8-11 12.151810000000001 12.151810000000001 12.151810000000001 ZT12-15 11.800709999999999 11.800709999999999 11.800709999999999 ZT16-19 11.79525 11.79525 11.79525 ZT20-23 11.91119 11.91119 11.91119