The sensitivity of TIMSS country rankings in science achievement to differences in opportunity to learn at classroom level

Large-scale Assessments in Education

An IEA-ETS Research Institute Journal

Table 1 Country-specific information for TIMSS 2015 participants

Country (grade)	ISO	N _school	N _class	N _teacher	N _student	M _age	ICGR
United Arab Emirates	ARE	477	763	580	18,012	13.9	6–9
Australia	AUS	285	645	998	10338	14.0	7–10
Bahrain	BHR	105	197	166	4918	13.9	7–9
Botswana (9)	BWA	159	169	165	5964	15.6	8–10
Canada	CAN	276	409	395	8757	14.0	Varies
Chile	CHL	171	173	171	4849	14.3	7–8
Egypt	EGY	211	215	213	7822	14.1
England	ENG	143	213	606	4814	14.1	6–8
Hong Kong SAR	HKG	133	145	144	4155	14.3	7–9
Ireland	IRL	149	204	418	4704	14.4	7–9
Iran, Islamic Rep. of	IRN	250	251	250	6130	14.1	7–9
Israel	ISR	198	198	282	5463	14.0	7–9
Italy	ITA	161	230	228	4481	13.8	6–8
Jordan	JOR	252	260	254	7865	13.8	1–10
Japan	JPN	147	147	147	4745	14.5	7, 8
Korea, Rep. of	KOR	150	170	167	5309	14.4	7–9
Kuwait	KWT	168	191	191	4503	13.8	6–9
Lebanon	LBN	138	185	182	3873	14.2	7–9
Malta	MLT	48	223	226	3817	13.8	7–11
Malaysia	MYS	207	326	294	9726	14.3	7–9
Norway (8)	NO8	142	216	207	4795	13.7	5–7, 8–10
Norway (9)	NOR	143	215	205	4675	14.7	5–7, 8–10
New Zealand	NZL	145	377	333	8142	14.1	7–9
Oman	OMN	301	356	347	8883	13.9	5–10
Qatar	QAT	131	238	222	5403	14.0	7–9
Saudi Arabia	SAU	143	149	149	3759	14.1	7–9
Singapore	SGP	167	334	320	6116	14.4	7, 8
Sweden	SWE	150	206	221	4090	14.8	7–9
Thailand	THA	204	213	205	6482	14.4	7–9
Turkey	TUR	218	220	218	6079	13.9	6–8
Chinese Taipei	TWN	190	191	201	5711	14.3	7–9
United States	USA	246	534	396	10,221	14.2	Varies
South Africa (9)	ZAF	292	328	319	12,514	15.7	7–9
Excluded countries
Georgia	GEO	153	187	171	4035	13.8	7–9
Hungary	HUN	144	241	171	4893	14.7	7–8
Kazakhstan	KAZ	172	239	206	4887	14.3	5–9
Lithuania	LTU	208	252	221	4347	14.6	7–8
Morocco	MAR	345	375	365	13,035	14.5	7, 8, 9
Russian Federation	RUS	204	221	209	4780	14.8	5–9
Slovenia	SVN	148	217	162	4257	13.9	6–7, 8–9

Sample sizes for schools, classes, teachers and students, average age (M_age), and the intended science curriculum grade range (ICGR). Countries below the line are excluded from further reporting because the amount of missing curriculum implementation data exceeds 50%. Intended curriculum grade range is retrieved from Mullis et al. (2016)