Table 1.

Mean DP-NF values (pre- minus DP-NF) following treatment in each group according to geometric mean of frequencies (geometric mean).

				Frequencies (geometric mean)
Groups	7206	5434	3616	2730	1818	1352	886	676
1	37,33	35	15,5	23	18	4	7,67	7
2	-11.6	-2.1	-1.5	-4.6	-0.9	-1.4	4.2	-1.2
3	52,0	40,0	31,0	21,3	16,3	19,3	1,5	10,0
4	28,0	21,6	22,3	16,0	21,0	4,0	24,0	6,7
5	18	23,10	20,5	28	21	6,67	14	7,7
p	< 0.001	0.018	0.14	0.001	0.694	0.40	0.572	0.230