Table 1.

Descriptive statistics (weighted sample), unmarried Malawian secondary school students, 2011–2013

	Total Mean	Min	Max	Males Mean	Females Mean
Dependent variable
Had no sex by wave 2	0.51	0.00	1.00	0.42	0.59
Initiate sex between two waves	0.10	0.00	1.00	0.11	0.08
Already had sex by wave 1	0.16	0.00	1.00	0.23	0.08
Lost-to-follow-up at wave 2	0.24	0.00	1.00	0.24	0.24
Individual-level
Age	16.21	11.00	29.00	16.70	15.71
Ethnicity
Chewa	0.51	0.00	1.00	0.53	0.49
Tumbuka	0.09	0.00	1.00	0.08	0.09
Yao	0.07	0.00	1.00	0.07	0.07
Ngoni	0.18	0.00	1.00	0.18	0.18
Others	0.15	0.00	1.00	0.14	0.16
Math performance	2.83	1.00	5.00	3.01	2.65
Top 10% wealth index	0.10	0.00	1.00	0.10	0.10
Parent’s secondary education completed	0.50	0.00	1.00	0.47	0.52
Father’s high occupational status	0.26	0.00	1.00	0.24	0.27
Household composition
Both parents	0.76	0.00	1.00	0.75	0.77
Mother only	0.14	0.00	1.00	0.13	0.14
Father only	0.05	0.00	1.00	0.06	0.04
No parents	0.05	0.00	1.00	0.06	0.05
School-level
Average class size	70.97	29.00	111.50	69.85	72.12
Rurality	0.14	0.00	1.00	0.14	0.13
Conventional Secondary School	0.16	0.00	1.00	0.18	0.15
% Have ever repeated	10.30	3.74	21.84	10.16	10.43
% Satisfied with school	23.24	6.80	60.92	23.38	23.09
Mean study after school	4.87	4.28	5.47	4.87	4.87
School socioeconomic composition	−0.04	−2.94	2.80	−0.10	0.01
% Top 10% wealth index	9.93	0.00	31.03	9.83	10.03
% Parent’s secondary school completed	49.64	12.87	72.46	48.88	50.42
% Father’s high occupational status	25.35	6.85	46.38	25.00	25.70
Observations	7916			3950	3966