condition mean min max ZT0-3 406.984126 406.984126 406.984126 ZT4-7 218.2555835 218.2555835 218.2555835 ZT8-11 229.99848249999997 229.99848249999997 229.99848249999997 ZT12-15 217.121254 217.121254 217.121254 ZT16-19 144.820023 144.820023 144.820023 ZT20-23 154.9656065 154.9656065 154.9656065