condition mean min max ZT0-3 8.5101225 8.477725 8.54252 ZT4-7 4.5172 4.5172 4.5172 ZT8-11 4.048455 4.048455 4.048455 ZT12-15 0 0 0 ZT16-19 5.58434 5.58434 5.58434 ZT20-23 6.38245 6.38245 6.38245