condition mean min max ZT0-3 11.179563 11.179563 11.179563 ZT4-7 12.445672 12.445672 12.445672 ZT8-11 15.70943 15.70943 15.70943 ZT12-15 12.1780965 12.1780965 12.1780965 ZT16-19 10.877559999999999 10.877559999999999 10.877559999999999 ZT20-23 12.9226235 12.9226235 12.9226235