Table 2 Descriptive statistics for prior attainment and diet data by Key Stage 2 results

Variable	KS2: lowest 20%		KS2: middle 60%		KS2: top 20%
Variable	Mean	SD	Mean	SD	Mean	SD
Key Stage 2* (KS2)	−1.47	0.62	0.12	0.44	1.12	0.20
Key Stage 1* (KS1)	−1.03	0.73	0.05	0.77	0.88	0.52
Entry Assessments	−0.69	0.78	0.05	0.78	0.60	0.78
Junk food at 3 years	0.35	1.02	−0.03	0.93	−0.35	0.82
“Health-conscious” at 3 years	−0.26	0.83	−0.08	0.96	0.13	1.03
“Traditional” at 3 years	0.01	0.95	0.02	1.02	−0.01	0.98
“Junk food” at 4 years	0.19	1.06	0.03	0.96	−0.16	0.88
“Health-conscious” at 4 years	−0.29	0.85	−0.08	0.95	0.18	1.01
“Traditional” at 4 years	−0.03	1.01	0.00	0.99	−0.02	0.93
“Junk” food at 7 years	0.24	1.06	0.06	0.96	−0.15	0.88
“Health-conscious” at 7 years	−0.22	0.93	−0.07	0.97	0.12	0.99
“Traditional” at 7 years	−0.02	1.08	0.03	1.00	−0.04	0.91
	Proportion		Proportion		Proportion
School meals (%)	22.0		17.6		16.5
Packed lunches (%)	39.1		41.3		43.0
Observations	1149		3444		1148

*National tests, Key Stage 1 taken at ages 6–7 and Key Stage 2 at ages 10–11.