condition mean min max ZT0-3 10.829067 10.829067 10.829067 ZT4-7 10.6571495 10.6571495 10.6571495 ZT8-11 10.7862415 10.7862415 10.7862415 ZT12-15 11.658277 11.658277 11.658277 ZT16-19 10.8292425 10.8292425 10.8292425 ZT20-23 11.63968 11.63968 11.63968