condition mean min max ZT0-3 8.425092 8.425092 8.425092 ZT4-7 9.289819999999999 9.289819999999999 9.289819999999999 ZT8-11 9.64388 9.64388 9.64388 ZT12-15 9.107831 9.107831 9.107831 ZT16-19 9.4007095 9.4007095 9.4007095 ZT20-23 9.893038 9.893038 9.893038