condition mean min max ZT0-3 400.119877 400.119877 400.119877 ZT4-7 219.215415 219.215415 219.215415 ZT8-11 266.0827805 266.0827805 266.0827805 ZT12-15 393.53201149999995 393.53201149999995 393.53201149999995 ZT16-19 413.0090695 413.0090695 413.0090695 ZT20-23 597.883613 597.883613 597.883613