condition mean min max ZT0-3 265.860148 265.860148 265.860148 ZT4-7 269.7863705 269.7863705 269.7863705 ZT8-11 277.2847345 277.2847345 277.2847345 ZT12-15 283.029801 283.029801 283.029801 ZT16-19 369.33399799999995 369.33399799999995 369.33399799999995 ZT20-23 399.00553249999996 399.00553249999996 399.00553249999996