condition mean min max ZT0-3 391.457364 391.457364 391.457364 ZT4-7 313.7139125 313.7139125 313.7139125 ZT8-11 325.0885195 325.0885195 325.0885195 ZT12-15 370.57822999999996 370.57822999999996 370.57822999999996 ZT16-19 399.646984 399.646984 399.646984 ZT20-23 331.542018 331.542018 331.542018