Table 1.

Light microscopic grading criteria.^*

0	Normal
1	Minimal focal hypercellularity
2	Moderate hypercellularity, early tubular dilatation
3	Diffuse hypercellularity, tubular dilatation, early crescents and sclerosis
4	Maximum lesion, diffuse hypercellularity, marked tubular dilatation, crescents, sclerosis and glomerular obsolescence

^*Based on grading system developed by Luo et al. Sections are graded in increments of 0·5.