condition mean min max ZT0-3 11.4283 11.4283 11.4283 ZT4-7 8.521815 8.521815 8.521815 ZT8-11 11.33975 11.33975 11.33975 ZT12-15 14.625499999999999 14.625499999999999 14.625499999999999 ZT16-19 17.74575 17.74575 17.74575 ZT20-23 14.057549999999999 14.057549999999999 14.057549999999999