condition mean min max ZT0-3 1.22382 1.22382 1.22382 ZT4-7 1.703275 1.703275 1.703275 ZT8-11 1.848215 1.848215 1.848215 ZT12-15 1.685405 1.685405 1.685405 ZT16-19 2.96755 2.96755 2.96755 ZT20-23 3.678125 3.678125 3.678125