condition mean min max ZT0-3 12.50649 12.50649 12.50649 ZT4-7 11.7989535 11.7989535 11.7989535 ZT8-11 9.028526 9.028526 9.028526 ZT12-15 11.0295115 11.0295115 11.0295115 ZT16-19 11.970893 11.970893 11.970893 ZT20-23 14.0275775 14.0275775 14.0275775