condition mean min max ZT0-3 10.09769 10.09769 10.09769 ZT4-7 5.187965 5.187965 5.187965 ZT8-11 9.462605 9.462605 9.462605 ZT12-15 13.7778 13.7778 13.7778 ZT16-19 22.10165 22.10165 22.10165 ZT20-23 12.741150000000001 12.741150000000001 12.741150000000001