households with valid information in all four waves can be at risk of moving into or out of poverty for one two or three waves in the uk and for one or two waves in the rest of the countries table a in the annex shows the same estimates in nongraphical format mean relative income growth rates have been calculated for each baseyear decile group in each period income growth among children is clearly propoor relative per cent income growth is highest in the poorest decile although the pattern is slightly different for each of the four periods considered mean income growth in the poorest decile slowed down over time it went from between and to between and and between and