condition mean min max ZT0-3 7.152628333333333 6.23295 7.806075 ZT4-7 7.104845 7.104845 7.104845 ZT8-11 13.77685 13.77685 13.77685 ZT12-15 17.006525 13.8061 20.20695 ZT16-19 12.94255 12.94255 12.94255 ZT20-23 13.480550000000001 13.480550000000001 13.480550000000001