condition mean min max ZT0-3 9.550052 9.550052 9.550052 ZT4-7 10.343604 10.343604 10.343604 ZT8-11 9.708662 9.708662 9.708662 ZT12-15 8.9192485 8.9192485 8.9192485 ZT16-19 9.598811 9.598811 9.598811 ZT20-23 9.1347435 9.1347435 9.1347435