condition mean min max ZT0-3 11.81768 6.0308399999999995 17.96575 ZT4-7 9.699275 9.699275 9.699275 ZT8-11 11.6793 11.6793 11.6793 ZT12-15 21.604975 20.8161 22.39385 ZT16-19 14.569600000000001 14.569600000000001 14.569600000000001 ZT20-23 21.8778 21.8778 21.8778