## Table 1 |
||||

Time course of pain intensity |
||||

Estimate of the β^{b} |
95% CI |
p-value |
||

(β1) Intercept | 7.5 | 5.2 | 9.8 | < 0.001 |

(β2) Coffee_{i}^{c} |
−3.5 | −7.2 | 0.2 | 0.064 |

(β3) Time_{ij}^{d} |
7.3 | 5.9 | 8.7 | < 0.001 |

(β4) BP90_{ij} |
−16.6 | −21.1 | −12.1 | < 0.001 |

(β5) Coffee_{i} * Time_{ij} |
−2.9 | −5.1 | −0.7 | 0.011 |

(β6) Coffee_{i} * BP90_{ij} |
3.4 | −3.8 | 10.6 | 0.34 |

Estimated regression coefficients with 95% confidence intervals (CI) based on the
fitted linear models^{a} of the pain intensity ratings (VAS, mm) in the active side of the shoulder and neck
during and after performing the 90 min computer work in subjects that had consumed
(n = 19) or abstained (n = 29) from coffee before start.

^{a}Linear mixed models for repeated measurements fitted with unstructured covariance
structure.

^{b}β2: the difference between coffee consumers and abstainers at baseline; β3: the change
per 15 min time period during the 90 min work task; β4: BP90 = break point 90 min,
i.e. the change from the work task ending and through each 15 min period during the
30 min recovery; β5: the difference between coffee consumers and abstainers for each
15 min period during the work task; β6: the difference between coffee consumers and
abstainers per 15 min periods during the recovery. ^{c}0 = No; 1 = Yes. ^{d}0 = Baseline; 1 = 15 min; 2 = 30 min, and so on.

Strøm * et al.*

Strøm * et al.* *BMC Research Notes* 2012 **5**:480 doi:10.1186/1756-0500-5-480