condition mean min max ZT0-3 15.198615 15.198615 15.198615 ZT4-7 10.427211 10.427211 10.427211 ZT8-11 11.122377499999999 11.122377499999999 11.122377499999999 ZT12-15 10.7498045 10.7498045 10.7498045 ZT16-19 11.2534315 11.2534315 11.2534315 ZT20-23 10.1595725 10.1595725 10.1595725