condition mean min max ZT0-3 9.298958 9.298958 9.298958 ZT4-7 9.064593 9.064593 9.064593 ZT8-11 9.605455500000001 9.605455500000001 9.605455500000001 ZT12-15 8.8649245 8.8649245 8.8649245 ZT16-19 10.185996 10.185996 10.185996 ZT20-23 10.0341565 10.0341565 10.0341565