condition mean min max ZT0-3 9.383674 9.383674 9.383674 ZT4-7 11.6317025 11.6317025 11.6317025 ZT8-11 11.850451 11.850451 11.850451 ZT12-15 11.2814415 11.2814415 11.2814415 ZT16-19 10.5231615 10.5231615 10.5231615 ZT20-23 9.9453635 9.9453635 9.9453635