Table 5.

Second analyst precision (ruggedness test)

	Day 1 precision, mg/100 g			Day 2 precision, mg/100 g			Days 1 and 2 precision combined, mg/100 g
Test material identification/replicates	Campesterol	Stigmasterol	beta-Sitosterol	Campesterol	Stigmasterol	beta-Sitosterol	Campesterol	Stigmasterol	beta-Sitosterol
Saw palmetto pygeum lycopene complex tablets
1	117	108	316	122	119	328
2	122	112	329	131	121	348
3	132	121	351	122	117	329
4	116	108	315	125	117	335
5	124	116	324	119	109	320
6	122	115	328	125	118	337
Mean	122	113	327	124	117	333	123	115	330
SDa	5.74	5.05	13.1	4.10	4.12	9.54	4.85	4.76	11.3
RSDr, %b	4.70	4.47	4.01	3.31	3.52	2.86	3.94	4.14	3.42
Target RSDr lowb	3	3	2	3	3	2	3	3	2
Target RSDr highb	4	4	3	4	4	3	4	4	3
PRSDRc	5.47	5.53	4.72	5.46	5.51	4.71	5.46	5.52	4.71
HorRatd	0.9	0.8	0.8	0.6	0.6	0.6	0.7	0.8	0.7
Saw palmetto (Serenoa repens) dried fruit CO2 extracts
1	40.4	22.7	145	43.2	25.6	157
2	42.0	26.6	151	42.6	24.0	152
3	42.7	25.5	153	43.1	24.7	155
4	42.8	25.8	154	43.9	25.2	159
5	42.6	24.9	153	44.3	25.1	159
6	44.0	25.9	157	40.3	25.5	145
Mean	42.4	25.2	152	42.9	25.0	155	42.7	25.1	153
SD	1.18	1.36	4.02	1.41	0.591	5.36	1.27	1.01	4.68
RSDr, %	2.78	5.40	2.64	3.29	2.36	3.46	2.97	4.02	3.06
Target RSDr low	3	3	3	3	3	3	3	3	3
Target RSDr high	4	5	4	4	5	4	4	5	4
PRSDR	6.41	6.93	5.29	6.40	6.94	5.28	6.40	6.94	5.29
HorRat	0.4	0.8	0.5	0.5	0.3	0.7	0.5	0.6	0.6

^aSD = Standard deviation.

^bRSD_r = Intralaboratory relative standard deviation.

^cPRSD_R= 2 C^−0.15, where C is the mean concentration expressed as a mass fraction.

^dHorRat = RSD_r/PRSD_R.