Availability, quality and price of produce in low-income neighbourhood food stores in California raise equity issues - CORRIGENDUM

Original text and correction:

ORIGINAL TEXT (page 1644, Results)

Table 3.

Average lowest price per pound and relative price difference of seven produce items by store type for stores in the CX³ sample. Relative price differences are the difference between the observed lowest store price and the average lowest price for chain supermarkets in the same county that month, expressed as a percentage of the average county chain supermarket lowest price

	Large groceries				Small markets				Convenience stores
Item	n	Average lowest price (range)	SD	Relative price difference	n	Average lowest price (range)	SD	Relative price difference	n	Average lowest price (range)	SD	Relative price difference	Relative price test significance*
Apples	218	$1.17 ($0.66, $2.99)	$0.39	44%	312	$1.18 ($0.63, $2.59)	$0.37	53%	130	$1.58 ($0.69, $2.80)	$0.50	110%	B, C
Bananas	218	$0.70 ($0.49, $1.49)	$0.16	15%	336	$0.85 ($0.49, $2.19)	$0.31	39%	150	$1.30 ($0.49, $2.19)	$0.46	115%	A, B, C
Oranges	200	$0.95 ($0.48, $1.49)	$0.40	35%	249	$0.88 ($0.47, $2.20)	$0.41	27%	88	$1.36 ($0.50, $2.20)	$0.59	107%	B, C
Carrots	179	$0.84 ($0.50, $2.14)	$0.33	33%	242	$0.91 ($0.50, $2.20)	$0.37	43%	24	$1.22 ($0.50, $2.00)	$0.58	102%	B, C
Tomatoes	197	$1.21 ($0.59, $2.66)	$0.45	13%	311	$1.12 ($0.59, $2.79)	$0.41	6%	57	$1.21 ($0.69, $2.19)	$0.38	23%	C
Broccoli	199	$1.30 ($0.68, $3.19)	$0.49	1%	142	$1.33 ($0.68, $3.18)	$0.56	6%	–	–	–	–
Cabbage	172	$0.74 ($0.38, $1.59)	$0.27	0%	261	$0.66 ($0.34, $1.50)	$0.26	–1%	–	–	–	–

^*The test significance column indicates the significance (at p<.05) of two-way tests of the hypothesis that the relative price differences differ between store type categories. The letter A indicates that ‘Large Groceries’ and ‘Small Markets’ stores have different relative price differences, B that ‘Large Groceries’ and ‘Convenience’ stores differ, and C that ‘Small Markets’ and ‘Convenience’ stores differ.

CORRECTION

The last line of Table 3, representing a composite analysis of five produce items, was omitted in the published version and is included in this corrigendum.

Table 3.

Average lowest price per pound and relative price difference of seven produce items by store type for stores in the CX³ sample. Relative price differences are the difference between the observed lowest store price and the average lowest price for chain supermarkets in the same county that month, expressed as a percentage of the average county chain supermarket lowest price

	Large groceries				Small markets				Convenience stores
Item	n	Average lowest price (range)	SD	Relative price difference	n	Average lowest price (range)	SD	Relative price difference	n	Average lowest price (range)	SD	Relative price difference	Relative price test significance*
Apples	218	$1.17 ($0.66, $2.99)	$0.39	44%	312	$1.18 ($0.63, $2.59)	$0.37	53%	130	$1.58 ($0.69, $2.80)	$0.50	110%	B, C
Bananas	218	$0.70 ($0.49, $1.49)	$0.16	15%	336	$0.85 ($0.49, $2.19)	$0.31	39%	150	$1.30 ($0.49, $2.19)	$0.46	115%	A, B, C
Oranges	200	$0.95 ($0.48, $1.49)	$0.40	35%	249	$0.88 ($0.47, $2.20)	$0.41	27%	88	$1.36 ($0.50, $2.20)	$0.59	107%	B, C
Carrots	179	$0.84 ($0.50, $2.14)	$0.33	33%	242	$0.91 ($0.50, $2.20)	$0.37	43%	24	$1.22 ($0.50, $2.00)	$0.58	102%	B, C
Tomatoes	197	$1.21 ($0.59, $2.66)	$0.45	13%	311	$1.12 ($0.59, $2.79)	$0.41	6%	57	$1.21 ($0.69, $2.19)	$0.38	23%	C
Broccoli	199	$1.30 ($0.68, $3.19)	$0.49	1%	142	$1.33 ($0.68, $3.18)	$0.56	6%	–	–	–	–
Cabbage	172	$0.74 ($0.38, $1.59)	$0.27	0%	261	$0.66 ($0.34, $1.50)	$0.26	–1%	–	–	–	–
Five-item average	230	$0.96 ($0.50, $1.74)	$0.25	27%	417	$1.02 ($0.50, $2.24)	$0.33	37%	194	$1.40 ($0.49, $2.24)	$0.47	102%	B, C

^*The test significance column indicates the significance (at p<.05) of two-way tests of the hypothesis that the relative price differences differ between store type categories. The letter A indicates that ‘Large Groceries’ and ‘Small Markets’ stores have different relative price differences, B that ‘Large Groceries’ and ‘Convenience’ stores differ, and C that ‘Small Markets’ and ‘Convenience’ stores differ.