Educationsystem	Schools in original sample	Eligible schools in original sample	Schools in original sample that participated	Substitute schools	Total schools that participated	Sampled students in participating schools	Students assessed
Australia	290	284	275	5	280	6,709	6,126
Austria	160	158	158	0	158	4,976	4,670
Azerbaijan	170	169	142	27	169	5,098	4,881
Belgium(French)-BEL	150	150	115	12	127	3,910	3,727
Bulgaria	150	147	142	5	147	5,725	5,261
Canada	1,142	1,125	1,106	5	1,111	25,707	23,206
ChineseTaipei-CHN	150	150	150	0	150	4,376	4,293
Colombia	157	152	131	19	150	4,309	3,966
Croatia	152	152	150	2	152	5,097	4,587
CzechRepublic	180	178	161	16	177	4,895	4,556
Denmark	240	236	207	25	232	4,994	4,594
England-GBR	150	148	109	20	129	4,243	3,927
Finland	150	146	141	4	145	4,914	4,640
France	175	175	170	4	174	4,638	4,438
Georgia	180	177	172	1	173	4,958	4,796
Germany	200	199	190	7	197	4,229	4,000
HongKong-CHN	154	150	130	2	132	4,189	3,875
Hungary	150	150	146	3	149	5,488	5,204
Indonesia	158	158	158	0	158	5,049	4,791
Iran,IslamicRep.Of	250	244	244	0	244	5,932	5,758
Ireland	152	151	148	3	151	4,849	4,524
Israel	153	153	150	2	152	4,579	4,186
Italy	205	205	166	36	202	4,529	4,189
Lithuania	160	154	145	9	154	5,140	4,661
Malta	99	96	96	0	96	3,958	3,598
Morocco	289	287	284	0	284	8,381	7,805
Netherlands	151	151	97	41	138	4,179	3,995
NewZealand	201	199	180	12	192	6,192	5,644
NorthernIreland-GBR	160	160	100	36	136	3,942	3,586
Norway	150	145	85	35	120	3,921	3,190
Oman	338	333	327	0	327	10,840	10,394
Poland	150	150	150	0	150	5,316	5,005
Portugal	150	150	133	15	148	4,428	4,085
Qatar	175	167	166	0	166	4,394	4,120
Romania	150	148	147	1	148	4,879	4,665
RussianFederation	202	202	202	0	202	4,693	4,461
SaudiArabia	175	171	163	8	171	4,625	4,507
Singapore	176	176	176	0	176	6,687	6,367
SlovakRepublic	200	198	187	10	197	5,933	5,630
Slovenia	202	201	193	2	195	4,674	4,512
Spain	314	314	308	4	312	9,223	8,580
Sweden	161	153	148	4	152	5,209	4,622
Trinidad andTobago	150	150	149	0	149	4,190	3,948
UnitedArabEmirates	478	460	458	0	458	15,372	14,618
UnitedStates	450	437	349	21	370	14,253	12,726