condition mean min max ZT0-3 27.350625 26.61675 28.0845 ZT4-7 24.65315 24.65315 24.65315 ZT8-11 26.31795 26.31795 26.31795 ZT12-15 0 0 0 ZT16-19 33.74145 33.74145 33.74145 ZT20-23 36.9011 36.9011 36.9011