condition mean min max ZT0-3 1.5017049999999998 1.5017049999999998 1.5017049999999998 ZT4-7 0.538166 0.538166 0.538166 ZT8-11 0.9820595 0.9820595 0.9820595 ZT12-15 0.86233 0.86233 0.86233 ZT16-19 1.8797300000000001 1.8797300000000001 1.8797300000000001 ZT20-23 1.3998249999999999 1.3998249999999999 1.3998249999999999