condition mean min max ZT0-3 318.633361 318.633361 318.633361 ZT4-7 269.94384249999996 269.94384249999996 269.94384249999996 ZT8-11 250.4393475 250.4393475 250.4393475 ZT12-15 280.5419485 280.5419485 280.5419485 ZT16-19 333.75337 333.75337 333.75337 ZT20-23 413.544756 413.544756 413.544756