condition mean min max ZT0-3 14.647953 14.647953 14.647953 ZT4-7 12.0008305 12.0008305 12.0008305 ZT8-11 14.6775555 14.6775555 14.6775555 ZT12-15 12.321795999999999 12.321795999999999 12.321795999999999 ZT16-19 12.219946 12.219946 12.219946 ZT20-23 11.781633 11.781633 11.781633