condition mean min max ZT0-3 12.004624 12.004624 12.004624 ZT4-7 13.011968 13.011968 13.011968 ZT8-11 9.848747 9.848747 9.848747 ZT12-15 10.8628855 10.8628855 10.8628855 ZT16-19 12.058853 12.058853 12.058853 ZT20-23 10.8761685 10.8761685 10.8761685