A Stability Indicating UPLC Method for the Determination of Tramadol Hydrochloride: Application to Pharmaceutical Analysis

Table 3

Results of precision study (𝑛=5).

Concentration; injected, μg mL^−1	Intraday precision			Interday precision
	Mean area ± SD	%RSD^a	%RSD^b	Mean area ± SD	%RSD^a	%RSD^b
150	4640550 ± 9012	0.19	0.28	4621200 ± 18068	0.39	0.23
200	6136915 ±10694	0.17	0.13	6124962 ±49690	0.81	0.19
250	7657557± 20715	0.35	0.27	7719500 ± 40184	0.52	0.78

^aRelative standard deviation based on peak area.
^bRelative standard deviation based on retention time.