condition mean min max ZT0-3 0.45425346625 0.3408618365 0.567645096 ZT4-7 1.15328148075 0.3229415975 1.983621364 ZT8-11 5.460416948 4.08109211 6.839741785999999 ZT12-15 6.94291245725 6.6521958715 7.2336290430000005 ZT16-19 3.2598033005000002 3.1656714675 3.3539351335000003 ZT20-23 3.158852812 3.0937131515000003 3.2239924725