condition mean min max ZT0-3 23.6749 23.6749 23.6749 ZT4-7 20.516399999999997 20.516399999999997 20.516399999999997 ZT8-11 22.9941 22.9941 22.9941 ZT12-15 27.042 27.042 27.042 ZT16-19 27.3138 27.3138 27.3138 ZT20-23 24.0488 24.0488 24.0488