condition mean min max ZT0-3 12.449711 12.449711 12.449711 ZT4-7 12.4915655 12.4915655 12.4915655 ZT8-11 12.496495 12.496495 12.496495 ZT12-15 12.10488 12.10488 12.10488 ZT16-19 12.102874 12.102874 12.102874 ZT20-23 12.0662415 12.0662415 12.0662415