condition mean min max ZT0-3 96.806613 96.806613 96.806613 ZT4-7 90.893147 90.893147 90.893147 ZT8-11 83.3507725 83.3507725 83.3507725 ZT12-15 83.4682255 83.4682255 83.4682255 ZT16-19 75.8761475 75.8761475 75.8761475 ZT20-23 94.960061 94.960061 94.960061