condition mean min max ZT0-3 9.808150000000001 9.808150000000001 9.808150000000001 ZT4-7 6.68152 6.68152 6.68152 ZT8-11 9.668035 9.668035 9.668035 ZT12-15 12.91655 12.91655 12.91655 ZT16-19 18.29925 18.29925 18.29925 ZT20-23 14.40485 14.40485 14.40485