Table 2

Frequency distribution of days absent from work prevaccination and postvaccination among mothers with a firstborn child in the first year of life during the epidemic period and the non-epidemic period, and among women aged 30–35 years old with no firstborn child during the epidemic period only

Days	2004	2005	2006	2007	2008	2009	2010	2011	2012
Full cohort of women with firstborn child, epidemic period
0	70	85	78	94	101	116	131	159	167
1	34	26	32	22	39	54	37	32	41
2	10	17	14	33	16	22	13	30	19
3	8	8	14	15	13	14	16	16	10
4	12	13	11	10	19	8	10	10	11
5	31	48	31	35	35	13	14	9	17
Total N	165	197	180	209	223	227	221	256	265
Total N of absent days	281	376	301	348	361	237	221	225	238
Average	1.703	1.909	1.672	1.665	1.619	1.044	1	0.879	0.898
95% CI +	2.005	2.201	1.955	1.924	1.873	1.264	1.236	1.09	1.116
95% CI−	1.401	1.617	1.389	1.406	1.365	0.825	0.764	0.668	0.68
Cohort of women aged 30–35 year, epidemic period
0	248	303	365	399	435	242	440	500	464
1	179	176	168	191	257	372	167	206	230
2	106	104	123	109	128	162	109	126	195
3	63	60	76	79	79	72	101	139	111
4	61	77	93	81	97	77	65	71	89
5	157	155	160	215	203	81	144	144	200
Total N	814	875	985	1074	1199	1006	1026	1186	1289
Total N of absent days	1609	1647	1814	2045	2153	1625	1668	1879	2309
Average	1.977	1.882	1.842	1.904	1.796	1.615	1.626	1.584	1.791
95% CI +	2.106	2.008	1.96	2.021	1.903	1.711	1.74	1.688	1.892
95% CI−	1.847	1.757	1.724	1.787	1.689	1.519	1.512	1.481	1.691
Full cohort of women with firstborn child, non-epidemic period
0	96	142	116	129	142	158	142	163	176
1	25	27	24	32	27	20	29	34	31
2	22	13	16	19	22	22	13	14	20
3	5	3	9	16	14	12	13	17	14
4	8	7	6	9	10	9	6	12	12
5	9	5	9	4	8	6	18	16	12
Total N	165	197	180	209	223	227	221	256	265
Total N of absent days	161	115	152	174	193	166	208	241	221
Average	0.976	0.584	0.844	0.833	0.865	0.731	0.941	0.941	0.834
95% CI +	1.203	0.801	1.07	1.026	1.063	0.931	1.156	1.136	1.023
95% CI−	0.749	0.367	0.618	0.639	0.668	0.532	0.727	0.746	0.645

N, working mothers.