Table 4 Percentages of those who changed their frequency of physical activity or diet from 1991 (33 y) to 1999 (41 y) by social class, qualifications and BMI

			Activity		Chips		Fried food		Fruit and salad
		^aN 100%	Increased n^b=1281 (m) 1472 (f)	Decreased n^b=1377 (m) 1512 (f)	Increased n^b=733 (m) 845 (f)	Decreased n^b=1469 (m) 1448 (f)	Increased n^b=1365 (m) 1590 (f)	Decreased n^b=1341 (m) 1276 (f)	Increased n^b=1349 (m) 1426 (f)	Decreased n^b=1003 (m) 1206 (f)
Social class ^c
Males
I and II		845	31	27	18	29	37	24	33	19
III NM		457	29	32	15	34	35	27	29	23
III M		2143	29	34	17	33	29	32	31	23
IV and V		930	29	30	15	38	28	34	29	27
	P ^d		0.84	0.01	0.55	0.007	0.02	0.02	0.70	0.004
Females
I and II		850	32	32	22	21	45	17	31	24
III NM		464	29	32	20	30	33	23	30	27
III M		2335	32	32	16	32	32	29	30	25
IV and V		1071	31	33	17	35	29	32	30	28
	P ^d		0.50	0.64	0.26	<0.0001	<0.0001	<0.0001	0.99	0.23
Education ^e
Males
Higher		1394	29	31	18	29	40	21	33	18
A level		1138	31	33	16	35	30	30	34	21
O level		1130	28	33	17	35	29	34	30	26
<O level		583	29	32	14	38	23	39	25	31
None		358	30	26	20	34	24	43	27	27
	P ^d		0.48	0.07	0.33	0.004	<0.0001	<0.0001	0.20	<0.0001
Females
Higher		1318	30	33	19	23	44	16	31	21
A level		534	34	29	20	26	39	24	29	26
O level		1827	33	33	16	33	31	29	31	26
<O level		820	30	31	15	34	26	35	28	28
None		470	26	35	21	37	23	40	30	28
	P ^d		0.05	0.25	0.01	<0.0001	<0.0001	<0.0001	0.62	0.003
BMI ^f
Males
1st quartile		1155	29	30	17	33	33	29	30	22
2nd quartile		1179	28	34	16	31	33	28	32	22
3rd quartile		1159	31	30	18	34	31	29	30	24
4th quartile		1147	29	32	16	36	28	36	31	24
	P ^d		0.44	0.24	0.28	0.04	0.25	0.01	0.80	0.29
Females
1st quartile		1185	31	32	18	26	39	23	30	23
2nd quartile		1184	32	32	17	32	35	26	32	25
3rd quartile		1196	32	32	18	30	32	30	29	25
4th quartile		1177	30	32	19	34	29	30	29	28
	P ^d		0.71	0.95	0.25	<0.0001	0.001	0.12	0.27	0.03

^aN given for participants with change in activity and social class/education/BMI data. Numbers for change in chips, fried food and fruit/salad consumption varies slightly (−8 to +2).
^bN given for participants with change in activity and social class data. Numbers for change in activity and education or BMI varies slightly (−16 to +91).
^cSocial class at birth. Social class V includes those with no male head of household.
^dP-value for χ²-test comparing those who increased or decreased their activity/diet with those who remained stable (stable category not shown).
^eQualifications in 1991 (33 y).
^fBMI in 1991 (33 y). 1st quartile is lowest. Quartile cutoffs, males; 23.1212, 25.1205, 27.5021 kg/m², females; 21.4421, 23.4501, 26.4453 kg/m².

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