condition mean min max ZT0-3 12.856741666666666 6.028125 19.5579 ZT4-7 9.43969 9.43969 9.43969 ZT8-11 39.9546 39.9546 39.9546 ZT12-15 59.3661 55.78045 62.95175 ZT16-19 46.145849999999996 46.145849999999996 46.145849999999996 ZT20-23 44.07525 44.07525 44.07525