condition mean min max ZT0-3 14.851255 14.851255 14.851255 ZT4-7 11.768180000000001 11.768180000000001 11.768180000000001 ZT8-11 11.283695999999999 11.283695999999999 11.283695999999999 ZT12-15 10.7287695 10.7287695 10.7287695 ZT16-19 12.544725 12.544725 12.544725 ZT20-23 11.3031415 11.3031415 11.3031415