condition mean min max ZT0-3 0.09624436666666666 0.06539855 0.11171819999999999 ZT4-7 0.08410994999999999 0.08410994999999999 0.08410994999999999 ZT8-11 0.0219531 0.0219531 0.0219531 ZT12-15 0.23160025 0.230989 0.23221150000000002 ZT16-19 0.16576649999999998 0.16576649999999998 0.16576649999999998 ZT20-23 0.21092450000000001 0.21092450000000001 0.21092450000000001