condition mean min max ZT0-3 18.529563 18.529563 18.529563 ZT4-7 14.129858500000001 14.129858500000001 14.129858500000001 ZT8-11 13.3070555 13.3070555 13.3070555 ZT12-15 13.5573975 13.5573975 13.5573975 ZT16-19 10.7154335 10.7154335 10.7154335 ZT20-23 10.900272000000001 10.900272000000001 10.900272000000001