condition mean min max ZT0-3 0.5936656060000001 0.560978331 0.626352881 ZT4-7 0.8481733797500001 0.5755595805 1.1207871790000001 ZT8-11 2.121611102 1.5689153265 2.6743068775000003 ZT12-15 3.92144795375 2.9457702435 4.897125664 ZT16-19 2.1626671657500003 2.0522314415 2.27310289 ZT20-23 4.234331578000001 3.426226723 5.042436433000001