condition mean min max ZT0-3 6.423807500000001 6.38447 6.463145 ZT4-7 4.822675 4.822675 4.822675 ZT8-11 5.89487 5.89487 5.89487 ZT12-15 0 0 0 ZT16-19 6.779120000000001 6.779120000000001 6.779120000000001 ZT20-23 6.795285 6.795285 6.795285