condition mean min max ZT0-3 157.078211 157.078211 157.078211 ZT4-7 471.46151799999996 471.46151799999996 471.46151799999996 ZT8-11 532.5527185 532.5527185 532.5527185 ZT12-15 406.91686749999997 406.91686749999997 406.91686749999997 ZT16-19 302.53063599999996 302.53063599999996 302.53063599999996 ZT20-23 185.16603500000002 185.16603500000002 185.16603500000002