condition mean min max ZT0-3 723.103488 723.103488 723.103488 ZT4-7 575.4016335 575.4016335 575.4016335 ZT8-11 638.5929115 638.5929115 638.5929115 ZT12-15 655.6565315 655.6565315 655.6565315 ZT16-19 743.688631 743.688631 743.688631 ZT20-23 788.352286 788.352286 788.352286