condition mean min max ZT0-3 2.0703472515 0.319954061 3.820740442 ZT4-7 6.78780234175 6.222318284 7.3532863995 ZT8-11 6.91016258325 6.277850292 7.5424748745 ZT12-15 5.52202984075 5.315581563 5.7284781185 ZT16-19 4.585789108249999 4.378006705 4.7935715115 ZT20-23 6.14676227 4.905258363 7.388266177