condition mean min max ZT0-3 45.834050000000005 42.14535 49.52275 ZT4-7 18.46435 18.46435 18.46435 ZT8-11 15.57865 15.57865 15.57865 ZT12-15 0 0 0 ZT16-19 26.6542 26.6542 26.6542 ZT20-23 28.99275 28.99275 28.99275