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| Study ID | B.L. FEV1 (% pred) | B.L. symp freq |
| Bisgaard 1988 | not stated | not stated |
| Keelan 1984 | not stated | symptoms 'insufficiently controlled' by bronchodilators and/or anti‐allergy therapy |
| Nicolaizik 1994 | not stated | symptoms 'inadequately controlled' |
| B.L: baseline |
