condition mean min max ZT0-3 9.00608 9.00608 9.00608 ZT4-7 8.19798 8.19798 8.19798 ZT8-11 6.4193 6.4193 6.4193 ZT12-15 5.9643 5.9643 5.9643 ZT16-19 8.425595 8.425595 8.425595 ZT20-23 9.13431 9.13431 9.13431