condition mean min max ZT0-3 0.341252 0.2805865 0.444141 ZT4-7 0.230255 0.230255 0.230255 ZT8-11 0.252621 0.252621 0.252621 ZT12-15 0.32637150000000004 0.3040835 0.3486595 ZT16-19 0.414991 0.414991 0.414991 ZT20-23 0.4391095 0.4391095 0.4391095