condition mean min max ZT0-3 476.462826 476.462826 476.462826 ZT4-7 706.137495 706.137495 706.137495 ZT8-11 424.8581475 424.8581475 424.8581475 ZT12-15 521.0623215 521.0623215 521.0623215 ZT16-19 492.8969315 492.8969315 492.8969315 ZT20-23 797.633959 797.633959 797.633959