Table 1.

Controls and MPHL scalp hair structural and/or functional parameters

Units	Parameter	Controls (Nl; n = 33)		MPHL (n = 22)			MPHL as % Nl
		Mean	SD	Mean	SD	P
n/cm2	Nano‐hair <20 µm	4	4	30	18	***	816
n/cm2	Anagen ≥20 µm	227	47	101	50	***	45
	Telogen ≥20 µm	37	23	115	53	***	309
n/cm2	Anagen ≥30 µm	221	47	84	48	***	38
	Telogen ≥30 µm	32	23	56	34	***	172
n/cm2	Anagen ≥40 µm	206	40	67	45	***	33
	Telogen ≥40 µm	25	21	26	17		103
n/cm2	Anagen ≥50 µm	189	33	57	43	***	30
	Telogen ≥50 µm	22	20	15	11		67
n/cm2	Exogen	1	1	10	7	***	780
LHGR	Hair diameter (D; µm)
µm/24 h	30 µm ≤ D < 60 µm	319	32	260	38	***	82
µm/24 h	D ≥ 60 µm	380	34	340	53	***	90

 The first columns show units applicable to a range of hair structural or functional parameters. These parameters appear in the next column along with thinnest hair (nano‐hair <20 µm) followed by thicker ones separated into anagen (bold) and telogen (italic) (with limits of diameters ≥20 µm up to ≥50 µm) and exogen hair ending with linear hair growth rates described according to a range of diameters (LHGR, µm/24 h; D between 30 and 60 µm or over 60 µm). Statistics (average and standard deviation respectively mean and SD) of absolute values are given next and appear, respectively, for data recorded in healthy males (controls; Nl; n = 33) comparatively with baseline values recorded at month 0 in panellists (MPHL; n = 22) followed by P values. With the exception of densities of intermediate‐terminal telogen (diameters ≥40 and ≥50 µm), all differences were statistically significant (***P values ≤.0005). The last column displays the average values in MPHL as a percentage of averages found in controls (MPHL as % Nl), and the variations reflect shortening of the duration of anagen phases when thinner hair categories are included.