Table 5 Household environment characteristics during pregnancy (MT2)
Category | Variables | N | Median | % |
|---|---|---|---|---|
(25th–75th percentiles) | ||||
Dwelling condition and material | Type of residence | 97,315 | ||
Wooden detached house | 40,269 | 41.4 | ||
Steel-frame detached house | 6190 | 6.4 | ||
Wooden multiple-dwelling house/apartment | 12,042 | 12.4 | ||
Steel-frame multiple-dwelling house/apartment | 37,861 | 38.9 | ||
Others | 953 | 1.0 | ||
Age of house/apartment building | 97,238 | |||
< 1 year | 5432 | 5.6 | ||
1 ≦ year < 3 | 10,920 | 11.2 | ||
3 ≦ year < 5 | 9152 | 9.4 | ||
5 ≦ year < 10 | 14,903 | 15.3 | ||
10 ≦ year < 20 | 22,610 | 23.3 | ||
20 years ≦ | 24,576 | 25.3 | ||
Unknown | 9672 | 9.9 | ||
Number of years living in the current place of residence (years) | 94,899 | 3 (1–5) | ||
Floor living on/number of floors in the apartment building | 63,509/67,230 | 2 (1–3)/2 (2–4) | ||
Number of rooms in the house/apartment | 97,293 | 3 (3–5) | ||
Size of the floor space of the house/apartment (m2) | 40,321 | 67 (50–100) | ||
House renovation/interior finishing after getting pregnant | 97,242 | |||
Yes (%) | 3076 | 3.2 | ||
Living in an all-electric house/building | 97,276 | |||
Yes (%) | 18,317 | 18.8 | ||
Small refuse incinerator on the premises of home | 97,408 | |||
Yes, but it is no longer used (%) | 1298 | 1.3 | ||
Yes, it is used still (%) | 2632 | 2.7 | ||
Use of a water purifier on a water faucet | 97,427 | |||
Yes (%) | 27,539 | 28.3 | ||
Mold | Mold growing somewhere in the house | 96,853 | ||
Yes (%) | 60,946 | 62.9 | ||
Number of responses | 98,051 | |||
Kitchen (yes, %) | 10,869 | 11.1 | ||
Living room (yes, %) | 2020 | 2.1 | ||
Mother’s bedroom (yes, %) | 5306 | 5.4 | ||
Other bedroom (yes, %) | 1122 | 1.1 | ||
Bathroom (yes, %) | 57,252 | 58.4 | ||
Lavatory (yes, %) | 4278 | 4.4 | ||
Other place (yes, %) | 2886 | 2.9 | ||
Pet | Having a pet currently | 97,538 | ||
Yes (%) | 22,483 | 23.1 | ||
Number of responses | 98,051 | |||
Cat (yes, %) | 6852 | 7.0 | ||
Bird (yes, %) | 682 | 0.7 | ||
Dog (kept in- and outside of residence, yes, %) | 13,597 | 13.9 | ||
Hamster (yes, %) | 1018 | 1.0 | ||
Turtle (yes, %) | 1166 | 1.2 | ||
Others (yes, %) | 4076 | 4.2 | ||
Air conditioning | Appliance mainly used to cool rooms in the house/apartment | 97,618 | ||
Air conditioner | 70,702 | 72.4 | ||
Electric fan | 24,223 | 24.8 | ||
Others | 281 | 0.3 | ||
Nothing | 2412 | 2.5 | ||
Use of a humidifier during the last year | 97,634 | |||
Yes (%) | 56,469 | 57.8 | ||
Use of a dehumidifier/dehumidifying function of an air conditioner during the last year | 97,564 | |||
Yes (%) | 58,808 | 60.3 | ||
Use of an air-cleaning device | 97,632 | |||
Yes (%) | 50,235 | 51.5 | ||
Heating appliance used in the living room during winter (yes, %) | 92,257 | |||
Yes (%) | 91,587 | 99.3 | ||
Type of heating equipment in living room | 98,051 | |||
Kerosene heater/kerosene fan heater | 48,454 | 49.4 | ||
Gas heater/gas fan heater | 7800 | 8.0 | ||
Kerosene/gas heater (with a chimney or an exhaust pipe that reaches outside of house) | 1514 | 1.5 | ||
Air conditioner/steam heater/oil heater | 53,741 | 54.8 | ||
Electric “kotatsu” (a table with an electric heater underneath, with a quilt)/electric heater/electric carpet/other electric heating equipment | 58,347 | 59.5 | ||
Central heating/floor heating | 5831 | 5.9 | ||
Charcoal/briquette “kotatsu” or “hibachi” (Japanese heating appliance using charcoal as fuel) | 669 | 0.7 | ||
Other equipment | 2404 | 2.5 | ||
Use of any equipment to heat a bed during winter | 96,376 | |||
Yes (%) | 30,262 | 31.4 | ||
Type of heating equipment in bed | 98,051 | |||
Electric “anka” (bed warmer) | 2969 | 3.0 | ||
Electric blanket | 12,608 | 12.9 | ||
Hot water bottle | 16,351 | 16.7 | ||
Other equipment | 1800 | 1.8 | ||
Cleaning | Materials covering the flooring of the living room | 97,475 | ||
Tatami (Japanese straw floor covering) | 11,285 | 11.6 | ||
Carpet on tatami | 8853 | 9.1 | ||
Flooring/wooden flooring/tiles | 34,574 | 35.5 | ||
Carpet on flooring/wooden flooring/tiles | 40,990 | 42.1 | ||
Other | 1773 | 1.8 | ||
Frequency of cleaning the floor of the living room with a vacuum cleanera | 97,616 | |||
Everyday | 17,156 | 17.6 | ||
A few times a week | 42,918 | 44.0 | ||
Once a week | 29,605 | 30.3 | ||
1–2 times a month | 5784 | 5.9 | ||
A few times a year | 915 | 0.9 | ||
Almost never or never | 1238 | 1.3 | ||
Frequency of cleaning the floor of the bedroom with a vacuum cleanera | 97,617 | |||
Everyday | 10,824 | 11.1 | ||
A few times a week | 38,693 | 39.6 | ||
Once a week | 34,392 | 35.2 | ||
1–2 times a month | 10,371 | 10.6 | ||
A few times a year | 1718 | 1.8 | ||
Almost never or never | 1619 | 1.7 | ||
Frequency of cleaning the “futon” (Japanese mattress and blanket for bedding) with a vacuum cleanera | 97,451 | |||
A few times a week | 3797 | 3.9 | ||
Once a week | 10,763 | 11.0 | ||
1–2 times a month | 16,369 | 16.8 | ||
A few times a year | 12,190 | 12.5 | ||
Almost never or never | 54,332 | 55.8 | ||
Frequency of airing the “futon” (Japanese mattress and blanket for bedding)a | 97,446 | |||
A few times a week | 8595 | 8.8 | ||
Once a week | 23,081 | 23.7 | ||
1–2 times a month | 36,214 | 37.2 | ||
A few times a year | 18,216 | 18.7 | ||
Almost never or never | 11,340 | 11.6 | ||
Use of anti-mite covers for “futon” or bedding after getting pregnant | 96,946 | |||
Yes (%) | 7767 | 8.0 | ||
Outdoor time | Spending time outdoors (hours per day) | 93,944 | 1.0 (1.0–2.0) | |
Mobile phone | Talk time (per day) | 97,648 | ||
I do not have a mobile phone | 144 | 0.1 | ||
None | 10,011 | 10.3 | ||
Less than 10 min | 69,381 | 71.1 | ||
For 10–60 min | 15,722 | 16.1 | ||
More than 1 h | 2390 | 2.4 | ||
Number of emails sent and received (per day) | 97,606 | |||
I do not have a mobile phone | 154 | 0.2 | ||
None | 2009 | 2.1 | ||
Less than 10 times | 83,153 | 85.2 | ||
More than 10 times | 12,290 | 12.6 |