condition mean min max ZT0-3 152.918635 152.918635 152.918635 ZT4-7 179.51436999999999 179.51436999999999 179.51436999999999 ZT8-11 171.79240099999998 171.79240099999998 171.79240099999998 ZT12-15 184.48724950000002 184.48724950000002 184.48724950000002 ZT16-19 173.7622875 173.7622875 173.7622875 ZT20-23 170.659188 170.659188 170.659188