condition mean min max ZT0-3 276.066704 276.066704 276.066704 ZT4-7 609.625415 609.625415 609.625415 ZT8-11 816.1951595 816.1951595 816.1951595 ZT12-15 521.865567 521.865567 521.865567 ZT16-19 285.705244 285.705244 285.705244 ZT20-23 232.945975 232.945975 232.945975