condition mean min max ZT0-3 7.9511650000000005 7.9511650000000005 7.9511650000000005 ZT4-7 5.305705 5.305705 5.305705 ZT8-11 4.997495000000001 4.997495000000001 4.997495000000001 ZT12-15 7.018075 7.018075 7.018075 ZT16-19 9.42868 9.42868 9.42868 ZT20-23 9.974305000000001 9.974305000000001 9.974305000000001