condition mean min max ZT0-3 8.011565000000001 8.011565000000001 8.011565000000001 ZT4-7 6.62961 6.62961 6.62961 ZT8-11 6.30378 6.30378 6.30378 ZT12-15 8.747935 8.747935 8.747935 ZT16-19 8.20684 8.20684 8.20684 ZT20-23 8.562755 8.562755 8.562755