condition mean min max ZT0-3 12.86235 12.86235 12.86235 ZT4-7 11.86675 11.86675 11.86675 ZT8-11 10.42195 10.42195 10.42195 ZT12-15 9.18336 9.18336 9.18336 ZT16-19 11.53125 11.53125 11.53125 ZT20-23 12.65145 12.65145 12.65145