condition mean min max ZT0-3 188.883583 188.883583 188.883583 ZT4-7 100.7425615 100.7425615 100.7425615 ZT8-11 120.417876 120.417876 120.417876 ZT12-15 139.8164495 139.8164495 139.8164495 ZT16-19 137.4149255 137.4149255 137.4149255 ZT20-23 114.384667 114.384667 114.384667