condition mean min max ZT0-3 12.24945 12.24945 12.24945 ZT4-7 8.88772 8.88772 8.88772 ZT8-11 9.459675 9.459675 9.459675 ZT12-15 12.24735 12.24735 12.24735 ZT16-19 14.731950000000001 14.731950000000001 14.731950000000001 ZT20-23 13.46045 13.46045 13.46045