condition mean min max ZT0-3 10.4511 10.4511 10.4511 ZT4-7 7.672805 7.672805 7.672805 ZT8-11 7.742075 7.742075 7.742075 ZT12-15 10.4266 10.4266 10.4266 ZT16-19 11.9984 11.9984 11.9984 ZT20-23 11.618749999999999 11.618749999999999 11.618749999999999