TABLE 3.

Evaluation of the experimental data obtained by PFGE of MRSA: survey of molecular size values^a

MRSA strain	Center 1		Center 2		Center 3		Center 4	Center 5	Center 6	Center 7		Center 8		Center 10		Center 11	Center 12	Avg value	Avg value
	IH	GP	IH	GP	IH	GP	IH	IH	IH	IH	GP	IH	GP	IH	GP	GP	IH	IH (SD)	GP (SD)
1	2,813	2,679	2,846	2,829	2,763	2,788	2,848	2,416	2,813	2,924	2,400	2,792	2,932	2,750	2,550	2,702	2,710	2,768 (130)	2,697 (165)
2	2,813	2,679	2,828	2,812	2,779	2,787	2,856	2,416	2,813	2,787	2,387	2,792	2,932	2,700	2,580	2,725	2,716	2,750 (120)	2,700 (164)
3	2,813	2,679	2,785	2,812	2,785	2,783	2,874	2,416	2,813	2,819	2,468	2,792	2,832	2,700	2,570	2,665	2,704	2,750 (122)	2,687 (124)
4	2,813	2,679	2,818	2,881	2,786	2,784	2,854	2,416	2,813	2,763	2,467	2,792	2,932	2,700	2,550	2,673	2,719	2,747 (119)	2,709 (156)
5	2,813	2,679	2,796	2,818	2,770	2,783	2,881	2,416	2,813	2,932	2,494	2,792	2,932	2,700	2,610	2,644	2,720	2,763 (133)	2,709 (135)
6	2,227	2,068	2,153	2,378	2,452	2,173	2,481	1,943	2,402	2,299	2,076	2,286	2,265	2,010	2,020	2,222	2,133	2,239 (172)	2,171 (118)
7	2,247	2,078	2,090	2,301	2,460	2,180	2,540	1,768	2,243	2,277	2,045	2,207	2,179	2,010	2,050	2,077	2,158	2,200 (207)	2,130 (87)
8	2,412	2,238	2,129	2,317	2,594	2,347	2,673	1,960	2,378	2,461	2,226	2,406	2,460	2,280	2,220	2,194	2,300	2,359 (198)	2,286 (88)
9	2,400	2,228	2,111	2,322	2,611	2,343	2,681	2,093	2,383	2,465	2,189	2,406	2,449	2,310	2,220	2,749	2,283	2,374 (179)	2,357 (180)
10	2,370	2,230	2,104	2,362	2,616	2,331	2,656	1,905	2,383	2,483	2,206	2,342	2,435	2,280	2,230	2,155	2,256	2,340 (213)	2,278 (92)
11	2,593	2,673	2,811	2,721	2,675	2,627	2,567	2,603	2,690	3,431	2,456	2,513	2,677	2,770	2,680	2,447	2,476	2,713 (260)	2,612 (104)
12	2,912	2,705	2,701	2,759	2,787	2,768	2,854	1,860	2,931	2,657	2,358	2,950	3,299	2,770	2,830	2,780		2,714 (317)	2,786 (255)
13	2,586	2,483	2,670	2,701	2,547	2,541	2,431	2,125	2,716	3,023	2,499	2,403	2,571	3,080	2,580	2,464	2,278	2,586 (287)	2,548 (74)
14	2,892	2,752	2,954	3,052	2,731	2,753	2,776	2,371	2,867	2,360	2,969	2,674	2,841	2,900	2,650	2,694	2,706	2,705 (193)	2,816 (136)
15	2,672	2,470	2,725	2,790	2,516	2,491	2,542	2,080	2,536	2,540	2,574	2,464	2,596	2,400	2,680	2,502	2,539	2,501 (166)	2,586 (107)
16	2,735	2,544	2,807	2,726	2,141	2,587	2,708	2,531	2,929	2,821	2,327	2,631	2,709	2,810	2,650	2,805	2,708	2,682 (208)	2,628 (154)
17	2,514	2,307	2,788	2,833	2,434	2,396	2,787	1,940	2,621	2,770	2,133	2,296	2,733	2,330	2,410	2,282	2,104	2,458 (279)	2,442 (233)
18	3,929	2,794	2,766	2,817	2,407	2,709	2,471	2,192	2,799	2,645	2,432	2,572	2,722	2,710	2,830	3,107	2,613	2,710 (441)	2,773 (185)
19	1,909	1,737	2,479	2,593	2,527	2,441	2,612	1,402	1,878	2,726	1,497	1,656	1,846	1,800	1,870	2,263	2,542	2,153 (448)	2,035 (372)
20	2,404	1,925	2,633	2,133	2,770	2,785	2,820	3,077	2,671	2,966	1,947	2,577	2,349	2,210	2,860	2,117		2,681 (253)	2,302 (354)

^aThe molecular length values are given in kilobase pairs. Centers 9 and 11 experienced some difficulties with efficient normalization and band recognition by the available software, hence, the absence of numerical data and the discrepancy of chromosome sizes for the identical isolates 1 to 5. For centers 4, 5, 6, and 11, the GP protocol did not give rise to interpretable results. Center 4 did not perform the GP analysis. SD, standard deviation. The average values are given per strain. When groups of isolates are considered, the following general averages were calculated: isolates 1 to 5, 2,756 (IH) and 2,700 (GP); isolates 6 to 10, 2,302 (IH) and 2,244 (GP); isolates 11 to 20, 2,590 (IH) and 2,552 (GP); IH, in-house protocol.