Table 5.

Microglial percentages and densities in different brain structures^a

	Cx				Cb				RoB
	I% all cells	I% O cells	I/mg	I/N	I% all cells	I% O cells	I/mg	I/N	I% all cells	I% O cells	I/mg	I/N
	(range and mean ± SE)	(range and mean ± SE)	(range and mean ± SE)	(range and I/mg vs N/mg, exponent. andp value)	(range and mean ± SE)	(range and mean ± SE)	(range and mean ± SE)	(range and I/mg vs N/mg, exponent andp value)	(range and mean ± SE)	(range and mean ± SE)	(range and mean ± SE)	(range and I/mg vs N/mg, exponent, andp value)
All clades	[1.84-10.98%] 5.77 ± 0.43%	[2.61-14.03%] 7.24 ± 0.50%	[1826-9048] 4375 ± 341	[0.053-3.362] −1.038 ± 0.088 p < 0.0001	[0.54-3.88%] 1.50 ± 0.15%	[2.98-24.56%] 7.37 ± 1.05%	[1234-10 536] 5021 ± 406	[0.007-0.046] −0.720 ± 0.224 p = 0.0038	[2.02-11.25%] 6.39 ± 0.51%	[2.18-11.85%] 7.20 ± 0.50%	[1780-9386] 4664 ± 464	[0.094-3.469] −1.033 ± 0.121 p < 0.0001
Per clade
Afrotheria	[4.90-7.46%] 6.04 ± 0.64%	[7.54-10.39%] 8.65 ± 1.31%	[1832-4192] 3170 ± 506	[0.115-2.086] −1.137 ± 0.200 p = 0.0296	[0.54-2.43%] 1.19 ± 0.34%	[3.05-18.29%] 7.45 ± 2.90%	[1234-5982] 4024 ± 789	[0.007-0.028] −0.298 ± 0.725 p = 0.7084	[3.08-6.92%] 4.89 ± 0.65%	[4.57-7.20%] 6.53 ± 0.50%	[1845-3450] 2897 ± 302	[0.094-2.626] −1.075 ± 0.113 p = 0.0025
Artiodactyla	[5.86-10.98%] 7.97 ± 1.17%	[6.42-12.03%] 8.61 ± 1.29%	[3718-9048] 5722 ± 1264	[0.675-1.405] −0.104 ± 0.714 p = 0.8971	[1.82-3.88%] 2.48 ± 0.47%	[5.40-24.56%] 12.67 ± 4.28%	[3040-10 536] 5781 ± 1644	[0.024-0.046] 0.557 ± 0.590 p = 0.4444	[6.07-11.25%] 8.76 ± 1.13%	[6.39-11.85%] 9.13 ± 1.19%	[3267-9386] 6036 ± 1361	[1.196-3.469] −0.458 ± 0.723 p = 0.5910
Carnivora	[5.47-10.19%] 7.69 ± 0.78%	[6.72-10.96%] 8.58 ± 0.72%	[3048-6530] 4770 ± 626	[0.295-3.362] −0.929 ± 0.176 p = 0.0132	[1.63-2.05%] 1.82 ± 0.06%	[4.08-11.10%] 6.90 ± 1.01%	[4174-9601] 5845 ± 826	[0.020-0.031] −0.078 ± 0.253 p = 0.7732	[3.11-10.59%] 6.63 ± 1.42%	[3.34-11.14%] 7.09 ± 1.49%	[1831-9269] 4821 ± 1351	[0.294-2.925] −0.721 ± 0.547 p = 0.2580
Marsupialia	[2.18-7.68%] 5.40 ± 0.61%	[2.61-9.75%] 6.82 ± 0.77%	[1826-6892] 4699 ± 567	[0.131-0.457] −0.680 ± 0.328 p = 0.0771	[0.66-1.71%] 1.07 ± 0.12%	[2.98-13.16%] 5.51 ± 1.02%	[2408-6893] 4721 ± 487	[0.008-0.022] −0.278 ± 0.494 p = 0.5894	[2.02-7.95%] 6.01 ± 0.57%	[2.18-9.01%] 6.80 ± 0.68%	[1780-6780] 4932 ± 476	[0.252-1.716] −0.811 ± 0.202 p = 0.0050
Primata	[1.84-8.26%] 3.75 ± 0.69%	[2.82-14.03%] 5.48 ± 1.27%	[1991-8294] 3692 ± 722	[0.053-0.225] −0.569 ± 0.298 p = 0.1044	NA	NA	NA	NA	NA	NA	NA	NA

^aI% all cells, Microglial percentage of all cells; I% O cells, microglial percentage of non-neuronal (other) cells; I/mg, number of microglial cells per milligram of structure; I/N, microglia/neuron ratio.