Table 2.

BMI Z-scores of adolescents in public schools in accordance with their characteristics during the LONCAAFS study, from 2014 to 2017

Variables	2014 (n 1431)					2015 (n 1178)					2016 (n 959)					2017 (n 773)
	n	%	Mean	sd	P	n	%	Mean	sd	P	n	%	Mean	sd	P	n	%	Mean	sd	P
Sex
Male	673	47	0·42	1·36	0·720	544	46	0·35	1·36	0·653	451	47	0·13	1·38	0·011	364	47	−0·04	1·33	0·001
Female	758	53	0·39	1·22		634	54	0·38	1·22		508	53	0·34	1·21		409	53	0·26	1·22
Skin colour
White	268	19	0·39	1·30	0·870	184	16	0·36	1·32	0·933	174	18	0·19	1·21	0·600	136	18	0·02	1·07	0·320
Non-white	1156	81	0·40	1·28		994	84	0·37	1·28		785	82	0·25	1·32		637	82	0·14	1·32
Mother’s schooling
Up to elementary school	482	41	0·37	1·26	0·315	392	38	0·37	1·26	0·934	295	35	0·28	1·29	0·841	207	30	0·18	1·21	0·695
Up to high school	337	28	0·43	1·25		280	27	0·41	1·30		208	25	0·21	1·27		185	27	0·08	1·26
Completed high school or higher	367	31	0·50	1·37		365	25	0·38	1·27		334	40	0·24	1·33		303	43	0·11	1·32
Economic class
Class A/B	463	37	0·51	1·30	0·056	132	12	0·43	1·27	0·835	111	13	0·21	1·31	0·932	242	34	0·08	1·29	0·604
Class C	737	58	0·39	1·28		559	52	0·37	1·30		479	55	0·26	1·31		413	58	0·16	1·28
Class D/E	59	4·7	0·12	1·25		378	35	0·41	1·25		281	32	0·26	1·29		61	8	0·03	1·04
Physical activity
Active	776	54	0·45	1·30	0·503	498	42	0·37	1·30	0·600	347	36	0·22	1·30	0·934	259	47	0·16	1·34	0·173
Inactive	655	46	0·35	1·27		680	58	0·36	1·27		610	64	0·26	1·30		514	53	0·09	1·25
Sedentary behaviour
≤ 2 h/d	343	24	0·25	1·24	0·011	301	26	0·26	1·27	0·104	292	31	0·26	1·26	0·743	337	44	0·09	1·33	0·563
> 2 h/d	1088	76	0·46	1·30		876	74	0·40	1·29		662	69	0·24	1·32		436	56	0·14	1·24
Waist circumference
Normal	1144	80	−0·02	1·02	0·000	948	80	−0·05	1·03	0·000	768	80	−0·17	1·05	0·000	621	81	−0·29	1·03	0·000
Above	282	20	2·16	0·59		230	20	2·10	0·60		189	20	1·94	0·67		150	19	1·80	0·73

LONCAAFS, Longitudinal Study on Sedentary Behavior, Physical Activity, Dietary Habits and Health of Adolescents.

Bold values are significant (P < 0·05).