condition mean min max ZT0-3 18.002049999999997 18.002049999999997 18.002049999999997 ZT4-7 13.487749999999998 13.487749999999998 13.487749999999998 ZT8-11 18.93185 18.93185 18.93185 ZT12-15 25.75445 25.75445 25.75445 ZT16-19 23.1276 23.1276 23.1276 ZT20-23 19.79975 19.79975 19.79975