condition mean min max ZT0-3 10.197980000000001 10.197980000000001 10.197980000000001 ZT4-7 11.2736 11.2736 11.2736 ZT8-11 8.61653 8.61653 8.61653 ZT12-15 7.609935 7.609935 7.609935 ZT16-19 12.046050000000001 12.046050000000001 12.046050000000001 ZT20-23 11.09705 11.09705 11.09705