Table 3.

Neuronal Density, Total Neuron Number, TH Immunopositivity, and Histology of the SNpc in Control Cases Divided in Groups According to Age.

Groups	Age (in weeks)	Number of cases	Neuron density		Neuron number		TH-immunopositive neuron number		Histology
			Range	M	Range	M	Range	M	Normal	Hypoplasia
I	4–8	4	101–120	108	492–535	506.5	221–246	232.2	4	/
II	9–12	2	100–120	110	521–530	525.5	234–265	249.5	2	/
III	13–16	3	89–100	92.6	328–403	363.6	213–240	230.3	3	/
IV	17–20	6	85–97	90.5	333–362	344.8	189–288	234.1	6	/
V	21–24	3	72–79	76.6	320–361	340.3	210–288	256.6	3	/
VI	25–30	2	68–71	69.5	287–315	301	252–275	263.5	2	/

Note. M = mean; TH = tyrosine hydroxylase.