condition mean min max ZT0-3 48.73285 46.1138 51.3519 ZT4-7 57.50025 57.50025 57.50025 ZT8-11 37.237449999999995 37.237449999999995 37.237449999999995 ZT12-15 0 0 0 ZT16-19 47.77605 47.77605 47.77605 ZT20-23 50.067499999999995 50.067499999999995 50.067499999999995