condition mean min max ZT0-3 12.137095 12.137095 12.137095 ZT4-7 11.7600055 11.7600055 11.7600055 ZT8-11 12.239098 12.239098 12.239098 ZT12-15 10.7540795 10.7540795 10.7540795 ZT16-19 11.3895065 11.3895065 11.3895065 ZT20-23 11.5919855 11.5919855 11.5919855