Table 2 Mean indoor CO 2 concentration (ppm) per school per week
From: A ventilation intervention study in classrooms to improve indoor air quality: the FRESH study
Week 1 | Week 2 | Week 3 | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
School | Condition | n | mean | sd | P98 | n | mean | Sd | P98 | n | mean | sd | P98 |
E1 | Intervention 1 (800–1200) | 344 | 1365 | 531 | 2991 | 344 | 902 | 85 | 1128 | 280 | 899 | 83 | 1051 |
E2 | 352 | 1337 | 460 | 2351 | 345 | 802 | 74 | 903 | 294 | 908 | 158 | 1126 | |
E3 | 286 | 1143 | 398 | 2052 | 285 | 753 | 78 | 902 | 320 | 900 | 99 | 1085 | |
E4 | 215 | 1648 | 353 | 2395 | 312 | 843 | 48 | 930 | 350 | 1059 | 99 | 1203 | |
E5 | 347 | 1466 | 330 | 2322 | 295 | 906 | 147 | 1347 | 257 | 1063 | 134 | 1276 | |
E6 | 255 | 2000 | 602 | 3321 | 270 | 915 | 44 | 993 | 297 | 1077 | 96 | 1195 | |
E7 | Intervention 2 (1200–800) | 356 | 1323 | 291 | 1963 | 356 | 993 | 140 | 1221 | 356 | 820 | 85 | 937 |
E8 | 354 | 1049 | 158 | 1313 | 321 | 905 | 130 | 1124 | 353 | 743 | 87 | 887 | |
E9 | 265 | 1763 | 423 | 2507 | 301 | 975 | 84 | 1159 | 336 | 764 | 51 | 853 | |
E10 | 222 | 763 | 131 | 1153 | 272 | 887 | 119 | 1150 | 334 | 858 | 76 | 938 | |
E11 | 367 | 1762 | 625 | 3064 | 352 | 995 | 151 | 1168 | 336 | 858 | 105 | 1018 | |
E12 | 347 | 1171 | 213 | 1553 | 343 | 1034 | 108 | 1182 | 309 | 925 | 70 | 1045 | |
C1 | Control | 380 | 1393 | 483 | 2446 | 379 | 2137 | 591 | 3179 | 379 | 2328 | 483 | 3197 |
C2 | 342 | 1176 | 289 | 1694 | 342 | 1100 | 255 | 1523 | 342 | 1249 | 347 | 1838 | |
C3 | 351 | 1112 | 333 | 1789 | 335 | 1132 | 304 | 1827 | 327 | 996 | 240 | 1527 | |
C4 | 350 | 1389 | 425 | 2264 | 340 | 1274 | 357 | 1982 | 340 | 1191 | 389 | 2362 | |
C5 | 353 | 779 | 177 | 1166 | 328 | 864 | 159 | 1234 | 312 | 740 | 151 | 1098 | |
C6 | 282 | 1399 | 311 | 1975 | 344 | 1677 | 377 | 2318 | 336 | 1509 | 538 | 2879 | |