condition mean min max ZT0-3 112.508879 112.508879 112.508879 ZT4-7 100.2705405 100.2705405 100.2705405 ZT8-11 109.180684 109.180684 109.180684 ZT12-15 131.10664 131.10664 131.10664 ZT16-19 144.17501049999998 144.17501049999998 144.17501049999998 ZT20-23 137.841217 137.841217 137.841217