Table 2.

Workload characteristics after becoming pregnant as reported via second/third trimester (MT2) questionnaire in the Japan Environment and Children’s Study (JECS)

Variables	N	%
Frequency of lifting something weighing more than 10 kg (including a child) after becoming pregnant	97,587
Never	32,133	32.9
1–3 times a month	17,251	17.7
1–4 times a week	15,582	16.0
5 times a week or more	32,621	33.4
Living or working in a noisy environment after becoming pregnant	97,502
No	87,260	89.5
Yes	10,242	10.5
Frequency of working sometime between 10 p.m. and dawn after becoming pregnant	97,491
Never	89,394	91.7
1–3 times a month	4614	4.7
1–4 times a week	3002	3.1
5 times a week or more	481	0.5
Frequency of working in a hot place that makes one sweaty after becoming pregnant	97,472
Never	89,385	91.7
1–3 times a month	3979	4.1
1–4 times a week	3059	3.1
5 times a week or more	1049	1.1
Frequency of going in and out of a commercial refrigerator or freezer after becoming pregnant	97,396
Never	93,039	95.5
1–3 times a month	1506	1.6
1–4 times a week	1967	2.0
5 times a week or more	884	0.9
Frequency of using a tool/equipment or riding a vehicle with a strong vibration after becoming pregnant	97,453
Never	95,911	98.4
1–3 times a month	939	1.0
1–4 times a week	383	0.4
5 times a week or more	220	0.2

N number of valid responses, MT2 questionnaire administered to second/third-trimester pregnant women