condition mean min max ZT0-3 5.18579 5.18579 5.18579 ZT4-7 5.73198 5.73198 5.73198 ZT8-11 3.195825 3.195825 3.195825 ZT12-15 4.588565 4.588565 4.588565 ZT16-19 4.6707350000000005 4.6707350000000005 4.6707350000000005 ZT20-23 3.8752699999999995 3.8752699999999995 3.8752699999999995