condition mean min max ZT0-3 8801.814899 8801.814899 8801.814899 ZT4-7 5733.783588 5733.783588 5733.783588 ZT8-11 4443.039749 4443.039749 4443.039749 ZT12-15 5653.443336 5653.443336 5653.443336 ZT16-19 12042.155621 12042.155621 12042.155621 ZT20-23 17173.610314999998 17173.610314999998 17173.610314999998