condition mean min max ZT0-3 21.4280247115 15.702301063 27.15374836 ZT4-7 9.90375624675 9.2199157235 10.587596770000001 ZT8-11 9.034336383 8.89031801 9.178354756000001 ZT12-15 8.60399755825 7.876722036 9.3312730805 ZT16-19 19.474899465 14.929284854999999 24.020514075 ZT20-23 41.83473089 31.476104645000003 52.193357135